Trainee Sport Tourer
Join Date: Jul 2020
Location: Sacramento, CA.
2008 FJR1300 Poor Gas Mileage
Had the bike in the shop for a throttle body sync and new spark plugs.
After I picked it up and parked it in the garage, I smelt gas vapors on the left side of the bike where the vent and overflow hoses come out of the tank.
Took it back to the dealership and they checked the gas tank and everything attached to it. No leaks of any kind where detected.
I suspect that I had overfilled the gas tank a day or so before I dropped off the bike at the shop, and there was some gas trapped in the canister. The smell of gas eventually subsided, and within a couple of days it had disappeared completely.
Over the last two fill-ups I noticed that the average gas mileage has decreased from 39.9 mpg to about 34.9- 35.7mpg. I am using 87 regular, Shell gas.
I am aware that living in California we get summer blend and winter blend, and because of that the mpg is supposed do drop some during the winter months.
Would that explain it, or do you guys think that may be something else causing this problem? The bike runs very strong, and it starts right away with no hesitation.
Tire pressure at 40psi front and 42psi rear.
Any input is appreciated!
Last edited by calboy; 01-08-2021 at 01:39 AM.