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post #1 of 18 (permalink) Old 04-21-2017, 10:23 AM Thread Starter
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Bonneville Miles Per Gallon

I just bought a used 2008 Bonneville T100 with 15,000 miles on it. It runs well, but I am surprised at how low the MPG is. I am able to go 110-120 miles until it needs to be switched to reserve gas. Filling it up at that point takes 3.65 gallons. Do the math on that, and I'm only getting about 30 MPG, which is not much better than my car!? Is that right, or is something wrong with my bike? I thought almost all motorcycles get much better gas mileage than cars.
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post #2 of 18 (permalink) Old 04-21-2017, 10:43 AM
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My efi fuel light comes on at about 115-120. I can go another 30-40 miles before I am empty.

So have you replaced the air filter and plugs yet?

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post #3 of 18 (permalink) Old 04-21-2017, 11:14 AM
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My bike tends to get around the same mpg when just riding around town. 2007 T100, ARK, Predator exhaust, pod filters, re-jetted for mods. I average 33mpg around town and have gotten up to 53.1mpg a tank when purely on freeway riding. This is taken from my Gas Cubby tracker app spread over 10362 miles 100 fill-ups, so pretty accurate.

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post #4 of 18 (permalink) Old 04-21-2017, 12:39 PM
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I have a carbed '08 Scrambler. I ride the thing fairly aggressively on the back-roads around here and usually get about 35 mpg. When riding with more mellow riders I have seen 47 mpg. I normally try to fill up before I hit 120 miles to be safe.

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post #5 of 18 (permalink) Old 04-21-2017, 02:51 PM
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If I ride economically I get about 160 miles from a tank including riding with the fuel light on for about 30 miles. I did get 42-ish miles from the reserve once but then I had to call a man to bring some more fuel. 2015 EFI T100 Black with Tors and dealer remap. The bike just isn't aerodynamic to start with, it's chubby too and the engine isn't the most efficient either. I love it but economical it isn't

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post #6 of 18 (permalink) Old 04-22-2017, 07:00 PM
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I usually gas up when the odometer shows about 100-110 miles on a tank. I have pushed to 138 before fueling. Filled up today: mpg? 47.8 mixed riding.

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post #7 of 18 (permalink) Old 04-22-2017, 08:25 PM
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The fuel light comes on between 130 and 135 miles.

MPG is usually 40 or so.
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post #8 of 18 (permalink) Old 04-22-2017, 08:34 PM
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"switched to reserve"? Don't think even the Carb'd bikes have traditional reserve tank that needs switching to. There is a fuel warning light that comes on at around 12 liters gone (out of 16.6 liter for EFI, or 16.0 Carb = about 4 gal tank). The warning light works via a temp sensor in the fuel level drops below level of sensor, its temp changes and this gives the warning. Note it will flicker on and off for a good while after it initially turns on...level is just at the sensor and as you go around corners/up/down hills, fuel will be sloshing on the sensor.

Once my light is on constantly, I figure (have verified over and over again at fill ups) I'm about 4 liters left in the tank...which is about 80 km or roughly 40 miles.

To get better mileage on carb bikes, I understand the jets and carb's can need to be cleaned, assuming you've also done the air filter/plugs. Also consider the fuel filter if it has not been done.

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Last edited by Tornado99; 04-22-2017 at 08:39 PM.
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post #9 of 18 (permalink) Old 04-22-2017, 09:33 PM
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There is indeed a reserve position on the petcock of a carbureted Bonneville. No warning light.
Mine hits reserve at 120 +- miles.

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post #10 of 18 (permalink) Old 04-23-2017, 04:06 PM
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A little extra data... Had a steady ride today, a mixture of relaxed cruising and twistier backroads with very brief bursts over 65 mph so definitely an economical run. Managed 171 miles before filling up. Overall 51 mpg imperial, 43 mpg US I believe. I think hyper-miling with the right weather conditions I could reach a tank range of 200 miles but I wouldn't want to be out of sight of a filling station...

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