Yamaha Star Bolt Motorcycle Forum

Yamaha Star Bolt Categories => General Yamaha Star Bolt Discussion => Topic started by: NY Andrew on October 28, 2020, 07:35:51 pm

Title: Fuel Capacity/Range Questions..
Post by: NY Andrew on October 28, 2020, 07:35:51 pm
Need some confusion cleared up...Iím totally overthinking this tonight.

Trying to make a note on my fuel information and this is what Iíve come up with so far:

* Average MPG: 47-61

* Fuel Tank Reserve: 0.74 gal (18-40 mile range)óbased off my previous math and what Iíve read the average is from owners.

* Fuel Tank Capacity: 3.4 gal (160-207 mile range)óbased off my above MPG calculations.

* Assuming Low Fuel Light: Between 94-122 miles with around 0.9-1.1 gal leftóif reserve=low fuel light this is based off my average MPG.


1. Does the fuel tank capacity INCLUDE the reserve? Or is the reserve AFTER the 3.4 gallons of fuel is used up thus the TRUE TANK SIZE is 4.14 gallons?..

2. When the low fuel light comes on is THAT the reserve miles countdown? Or is the reserve still in the tank after a certain amount of mileage while the low fuel light is on?..


Did 107 miles on a tank yesterday with 1.76 gallons which ends up being 61 MPG.
I had 1.64 gallons left.
That means I could have almost gone 215 miles on the entire 3.4 gallon tank???
The reserve would have kicked in around 160 miles and could have gone 40-55 more???
Title: Re: Fuel Capacity/Range Questions..
Post by: DrM on October 28, 2020, 08:43:51 pm
The 2018 and on Bolts have a 3.8 3.4 gal tank, which is a little bigger than your tank.  I have never filled the tank to the tippy-top, and I have never run it to empty.  The longest run I have made without refueling is 153 miles.  I could only put 2.6 gallons into the tank (backup up to the bottom of the filler tube) afterwards.  Unfortunately, I don't keep a record of how many miles I run with the low fuel light on, but I know it varies from maybe 5 miles to maybe 37 miles.
I get anywhere from 50 to 60 miles per gallon, depending on speed and number of stoplights I get caught at. 

One day I will buy one of those fuel jugs Harley riders use and run the fuel tank dry just to see how many gallons of fuel it actually holds up to the bottom of the filler tube.  Sorry, I can't help you more.
Title: Re: Fuel Capacity/Range Questions..
Post by: NY Andrew on October 28, 2020, 08:51:44 pm
The 2018 and on Bolts have a 3.8 gal tank, which is a little bigger than your tank.  I have never filled the tank to the tippy-top, and I have never run it to empty.  The longest run I have made without refueling is 153 miles.  I could only put 2.6 gallons into the tank (backup up to the bottom of the filler tube) afterwards.  Unfortunately, I don't keep a record of how many miles I run with the low fuel light on, but I know it varies from maybe 5 miles to maybe 37 miles.
I get anywhere from 50 to 60 miles per gallon, depending on speed and number of stoplights I get caught at. 

One day I will buy one of those fuel jugs Harley riders use and run the fuel tank dry just to see how many gallons of fuel it actually holds up to the bottom of the filler tube.  Sorry, I can't help you more.
I do have a 2018 R-spec. The manual stated 3.4g but youíre saying itís actually 3.8g?..

Debated a fuel jug as well to test it out but I have the rear fender rack no sissy bar so limits the setup.
Title: Re: Fuel Capacity/Range Questions..
Post by: DrM on October 29, 2020, 08:36:29 am
Ooopps!  You're right -- 3.4 gallons is what my 2019 manual says also.  My bad.
Title: Re: Fuel Capacity/Range Questions..
Post by: NY Andrew on October 29, 2020, 01:05:00 pm
Haha all good. Thought I was tripping. 3.8 woulda made more sense for my math prob.
Title: Re: Fuel Capacity/Range Questions..
Post by: lunkhead on October 29, 2020, 01:42:01 pm
Highest I got was 71 mpg twice and they're much flatter roads out west so it could be better. Usually, I get about 50.

2016 (2.46 + 0.74) = 3.20 gal
2017 (2.66 + 0.74) = 3.40 gal

Mileage @ 41 mpg
2016 (100.9 + 30.3) = 131.2
2017 (109.1 + 30.3) = 139.4

Mileage @ 51 mpg
2016 (125.5 + 38.7) = 164.2
2017 (135.7 + 38.7) = 174.7

Mileage @ 61 mpg
2016 (150.0 + 45.1) = 195.1
2017 (162.3 + 45.1) = 207.4

Mileage @ 71 mpg
2016 (174.6 + 52.5) = 227.1
2017 (188.9 + 52.5) = 241.4
Title: Re: Fuel Capacity/Range Questions..
Post by: DrM on October 29, 2020, 05:26:28 pm
Highest I got was 71 mpg twice and they're much flatter roads out west so it could be better. Usually, I get about 50.

2016 (2.46 + 0.74) = 3.20 gal
2017 (2.66 + 0.74) = 3.40 gal

Mileage @ 41 mpg
2016 (100.9 + 30.3) = 131.2
2017 (109.1 + 30.3) = 139.4

Mileage @ 51 mpg
2016 (125.5 + 38.7) = 164.2
2017 (135.7 + 38.7) = 174.7

Mileage @ 61 mpg
2016 (150.0 + 45.1) = 195.1
2017 (162.3 + 45.1) = 207.4

Mileage @ 71 mpg
2016 (174.6 + 52.5) = 227.1
2017 (188.9 + 52.5) = 241.4
Is that 3.4 gallons to the bottom of the filler tube?
Title: Re: Fuel Capacity/Range Questions..
Post by: lunkhead on October 29, 2020, 07:14:04 pm
The 3.2 gallons is what Yamaha claims for all 2016 Bolts and 2015 C-Spec. Other 2015 Bolts were 3.17 and 2014 were 3.22. Sounds like one was probably measured to the bottom of the filler neck and one to the top and later rounded to 3.2.
Title: Re: Fuel Capacity/Range Questions..
Post by: tramp on November 10, 2020, 06:42:36 am
Got a 2014 r spec
Fuel light comes on about120
Have driven 30 miles after
Title: Re: Fuel Capacity/Range Questions..
Post by: Sdaniels on November 17, 2020, 11:42:10 am
Does anybody get lower mileage at interstate speeds?  I average 42-44 when I'm in town.  It's roughly half & half city/highway but when I road to my son for a visit I got quite a bit lower mileage.  It's 67 miles & only about 2 miles of that is city riding.  I run between 75-80 on the interstate.
Title: Re: Fuel Capacity/Range Questions..
Post by: joko on November 17, 2020, 02:21:53 pm
I ride mostly freeways at about 80mph and get about the same mileage as Tramp.
Title: Re: Fuel Capacity/Range Questions..
Post by: DelawarePete on November 17, 2020, 02:47:04 pm
I ride 100 miles 1 way to work, 90 of those miles are at 75-85 mph.  My fuel light comes on around 70-75 miles.
Title: Re: Fuel Capacity/Range Questions..
Post by: Sdaniels on November 17, 2020, 03:26:11 pm
I ride mostly freeways at about 80mph and get about the same mileage as Tramp.

So two bikes running roughly the same speed but with 45 miles to the tank difference?  How are you getting 45 more miles to the tank than DelawarePete?  I don't get how that works.  Do either of you use a Koso meter?  Wondering if the tire percentage setting might be skewing these numbers.  Anyway, I'm getting away from the point about lower mileage at interstate speeds.  I expected better mileage from interstate miles.  Might look at the Stryker pulley.
Title: Re: Fuel Capacity/Range Questions..
Post by: DrM on November 17, 2020, 04:34:26 pm
Many factors affect fuel mileage:

lower milage - - - -  - - - - higher milage
Riding against the wind - - - Riding with the wind
high temperature - - - - - - - Low temperature
riding uphill  - - - - - - - - - -riding downhill
riding in lower gears - - - - - riding in higher gears
Lots of traffic stops - - - - - - few or no traffic stops
riding at top speed - - - - - - riding slower in top gear
poor fuel quality  - - - - - - - high fuel quality
thicker engine oil - - - - - - -thinner engine oil
heavier rider & cargo - - - - lighter rider and cargo
lower tire pressure - - - - - -higher tire pressure
poor engine tune - - - - - - - good engine tune
aftermarket fuel manager - - no aftermarket fuel manager

just to name a few.

Title: Re: Fuel Capacity/Range Questions..
Post by: Sdaniels on November 17, 2020, 04:48:17 pm
Many factors affect fuel mileage:

lower milage - - - -  - - - - higher milage
Riding against the wind - - - Riding with the wind
high temperature - - - - - - - Low temperature
riding downhill - - - - - - - - -riding uphill
riding in lower gears - - - - - riding in higher gears
Lots of traffic stops - - - - - - few or no traffic stops
riding at top speed - - - - - - riding slower in top gear
poor fuel quality  - - - - - - - high fuel quality
thicker engine oil - - - - - - -thinner engine oil
heavier rider & cargo - - - - lighter rider and cargo
lower tire pressure - - - - - -higher tire pressure
poor engine tune - - - - - - - good engine tune
aftermarket fuel manager - - no aftermarket fuel manager

just to name a few.

Those are obvious & don't help explain the difference between DelawarePete & Joko's mileage.
Title: Re: Fuel Capacity/Range Questions..
Post by: joko on November 17, 2020, 05:40:36 pm
Many factors affect fuel mileage:

lower milage - - - -  - - - - higher milage
Riding against the wind - - - Riding with the wind
high temperature - - - - - - - Low temperature
riding downhill - - - - - - - - -riding uphill
riding in lower gears - - - - - riding in higher gears
Lots of traffic stops - - - - - - few or no traffic stops
riding at top speed - - - - - - riding slower in top gear
poor fuel quality  - - - - - - - high fuel quality
thicker engine oil - - - - - - -thinner engine oil
heavier rider & cargo - - - - lighter rider and cargo
lower tire pressure - - - - - -higher tire pressure
poor engine tune - - - - - - - good engine tune
aftermarket fuel manager - - no aftermarket fuel manager

just to name a few.

Those are obvious & don't help explain the difference between DelawarePete & Joko's mileage.


With all my gear and laptop and everthing I'm probably about 160 lbs or so.  I've got a mini fairing, most wind catches my just my helmet, 87 octane, and about half my commute is usually against the wind most days.  33f/36r psi.  Mobile 1 15/50 full synth.  No koso.  Only a few miles non freeway, Pete said he's got about 10 miles of local riding which could make a difference if you're hitting a lot of lights.  Did you monitor your mileage before the koso?  I would def think freeway miles would give you better gas mileage. 
Title: Re: Fuel Capacity/Range Questions..
Post by: DrM on November 17, 2020, 07:42:32 pm
Many factors affect fuel mileage:

lower milage - - - -  - - - - higher milage
Riding against the wind - - - Riding with the wind
high temperature - - - - - - - Low temperature
riding downhill - - - - - - - - -riding uphill
riding in lower gears - - - - - riding in higher gears
Lots of traffic stops - - - - - - few or no traffic stops
riding at top speed - - - - - - riding slower in top gear
poor fuel quality  - - - - - - - high fuel quality
thicker engine oil - - - - - - -thinner engine oil
heavier rider & cargo - - - - lighter rider and cargo
lower tire pressure - - - - - -higher tire pressure
poor engine tune - - - - - - - good engine tune
aftermarket fuel manager - - no aftermarket fuel manager

just to name a few.

Those are obvious & don't help explain the difference between DelawarePete & Joko's mileage.
Here are some more:
 - Lower Mileage - - - - - - - - Higher mileage
dirty air filter - - - - - - - -- - - - clean air filter
worn tire tread - - - - - - - - - - - new tire tread
big windshield - - - - - - - - - - - small windshield
heavy throttle hand - - - - - - -  light throttle hand

They are not just additive but can be interactive.  Some of them you can't do anything about, but most of them can be addressed by the rider.  But if you think none of these are important, then I could see why you might be getting poor gas mileage.

This reminds me of a time in Saudi Arabia when I used to drive petal-to-the-metal (around 100 mph) in a new chevy impala from King Khalid Military City down to Riyadh.  Starting with a full tank of gas I would only get halfway (to Buraydah) before having to refill the tank.  But if I took my time and drove normally (50 or 60 mph) I could get all the way to Riyadh on a single tank of gas.  Now that is one hell of a difference in milage - over 50% difference.
Title: Re: Fuel Capacity/Range Questions..
Post by: Smolka on November 18, 2020, 12:37:54 am
For reference (if anyone cares) I just purchased a 2014 Bolt with Vance & Hines pipes, exhaust and fuel meter and my low fuel light comes on at 81-86. 87 Octane and sitting at 70-75 on the freeway.
Title: Re: Fuel Capacity/Range Questions..
Post by: lunkhead on November 18, 2020, 01:29:13 am
The stock airbox takes in air that's >15*F warmer than an open filter. So, to maintain any given cruising speed, the throttle plates will be open more which reduces pumping losses. Also, slightly more fuel gets vaporized due to the extra heat so the fuel burns more completely in the combustion chamber.

At high altitudes, the rarefied air also requires a wider (less restrictive) throttle opening to maintain the same lower altitude speed. Air resistance against the bike and rider is also less and a lower octane can be used because dynamic cylinder compression goes down. It's said there's about a 10% increase in fuel efficiency at 10,000'.
Title: Re: Fuel Capacity/Range Questions..
Post by: DelawarePete on November 18, 2020, 11:02:04 am
100% disclosure....I ride like a total asshole most of the time.  I always accelerate like I'm trying to win the hole shot at every light.  My setup is Big Air Kit open air cleaner, VH Comp Exhaust, Cobra FI2000.  I'm one of the first people to have the KOSO, and my shit is locked in.  My bike also has to move more mass than Joko.  He's fully loaded at 160lbs, that was my fighting weight in 1993.  I'm 5'9" and about 215lbs (most of it in my testes), plus I have the fairing, saddlebags, and I live in Delaware, right at sea level, and it's flatter than most of my dad jokes. 

There was ONE night I rode home in a storm for the entire 100 mile trip. I went the speed limit the entire way, like a little bitch.  My fuel light came on at 128 miles.  That's 53 MPG.  So I'm sure if I rode my bike like a tool and went the speed limit everywhere, everyday, I would spend less on gas.  Regardless I'm going to have to fill up before I go to work AND on my way home.  And it's like 5 bucks to fill up so who cares?   
Title: Re: Fuel Capacity/Range Questions..
Post by: Sdaniels on November 18, 2020, 04:44:36 pm
Okay, so Joko behaves on the bike & Pete is a hooligan.  That's where I'm betting most of the mileage variance comes from.  I did monitor the mileage before the Koso...didn't notice any changes.  I run 35F, 37R tire pressures & weigh in at around 210 with gear.  I get about 105 miles before the light comes on, with a few instances slightly higher/lower.  I got Ivans flash after putting on the K&N cleaner (not the round one) & the Danmoto slipon.  I think the plugs show slightly richer but that could be just in my head.  The only reason I questioned  this is because the first trip I made, I didn't think anything when the fuel light came on because I was about 18 miles out & thought there was plenty of reserve to get me home...then the dreaded sensation of running out of fuel happened.  I keep the clock function on the Koso.  When I cycled through to the trip meter it showed reserve came on at 90 miles.  I would have known something was up if I saw that mileage.  It's all good.  LIke you said Pete, gas is cheap at the moment.  Still wondering about the Stryker pulley.  Can't find any posts about gas mileage increase with the swap.