[Busashot]

Everytime you perform certain modifications that allow the engine to run more efficiently ie; exhaust and intake mods, don't be surprised to see MPG to go up. Using less throttle to move a vehicle will result in better gas mileage. Big bore bikes get good mileage from the factory because of the available low end torque advantage compared to high rpm litre bikes or smaller sizes. Lower gearing can help too until certain speeds are reached but typically for most of us, gas mileage will suffer.

With a Brock/Hindle exhaust, airbox mods, BMC filter and other small mods, the best I ever got was 51MPG. After adding cams and gearing it went down to 36-38mpg.

Note: Some of the available pump gas around here did show some significant differences in the MPG area. Bad fuel and MPG could go as low as 30MPG.