Tire pressure, dirty air filter, sprockets changed all big factors of gas milage. First I would check your tire pressure because between running at 36 and 40 I get another 30-40 miles from a tank of gas.

Mike

 

+1

 

...nothing wrong with riding and shifting "like a puss..."when your riding to work and using your bike over the truck for economical reasons. cruz below 5k, have less "buzz" with less power...no need to rip on it or be ready to rip on it any all times. Espically when cruz' n to work or the store, etc.
n

 

Highway riding has HUGE effects on Mileage! One highway ride can increase your Miles per tank by 30-40 miles.

 

Lol thats the exact opposite for me. Around town I get about 140-150 miles a tank cause I'm rarely going over 60mph and usually short short shift it. I eventually filled up at 190 miles on the ODO. My last tank netted 43mpg.

On the highway on the other hand, I am always at least above 7k (usually hovering around 80-85mph) in 6th and my res will light up at 120.

Down 1 tooth in the front. K&N air filter, PC3, Scorpion High mount would be the mods to the the motor/drivetrain.

 

just throwing this out here becuase some people have speedohealers, and stock speedos are high, making you think you get better mileage

 

Got the speedohealer and I get around 38 in town and 55 on the highway. And in town I am in the redline. On the highway...I am up to 6th and crusing around 7K's.

 

Stock speedo is a tad high(4~5mph).But checked against my gps and the mileage difference at the end of a tank on mine is less than .2 of a mile.

I average 43~45mpg.Stock gearing ,and mods in the sig. 150miles on average before reserve light comes on.This is over a 10 tank average and i fill it up to the same spot everytime.

Gas mileage like others said is effect by MANY things:
1-tire pressures
2-how good of shape your bike is in
3-driving style
4-highway vs city driving
5-how you full you fill of your tank(wether the bike is on its stand or with you holding it straight up when filling it up).
6- brands of gas can effect mileage due to different additive packages they have in them.
7-octane used will also effect gas mileage ,running 89 or 93 in mine nets me about a 4mpg loss(again over a 10 tank average).

Saying your bike gets xxx mileage is not correct unless you average it out over at least 5~10 tank fill ups.

 

^ Out of curiousity, what octane do you run? 87? 91?

 

I believe F4's from 1999-2002 will average 37-38mpg.