I probably get low to mid 30's. But I haven't ever kept an overly close eye on it.

 

ethanol can make a difference in milage, I lose a couple per gallon when it in the tank.

 

ain't that the truth..

I've ran two tanks through my bike now since I picked it up. The 1st tank I got 150 miles w/ 3 res bars showing and put in 4 gallons(37.5mpg). Today I put on 140 miles w/ 2 res bars showing and put in 3.7 gallons(37.7mpg). On my 2nd tank of gas I was riding pretty hard and I also ran 4.5oz of seafoam in that tank. The petcock on my F3 was way more reliable.


Moses

 

14 fillups this summer.
Max mileage was 41.73MPG (60 MPH with a 15MPH tailwind)
Min mileage was 29.46MPG (Pushing 80 MPH into a 20MPH wind)
Avg overall was 35.27MPG (50/50 City/Highway)
02 with 23000 miles & Stock gearing

 

I thought I would revisit this as I have been keeping a precise log on my iphone in an app called Road Trip. I use my 2006 model for commuting to work across London. The bike has been returning consistently between 35 and 36 mpg (UK) which I gather is about 29 or so US. The bike is standard apart from an air filter, and an aftermarket exhaust. This mpg has been recorded over the last couple of months when it has been pretty cold. I hope to keep the log going into summer also.

 

You mean carburetor sync (fuel injected bikes don't have carburetors. Maybe you're talking about a valve clearance check?).

The idea that axle grease is causing a difference in MPG is laughable.

Check how many teeth those sprockets have, check to see if you have an o2 sensor (might be dirty), and change your oil.

Personally I live in south Florida, run 87 octane, and have not had any knocking even at very hot trackdays. Run what your bike says to run, but buy good gas. On something a bit more modern with higher compression, I would probably be hesitant to run 87 though, at least at the track. If you have a piggyback like a PC, when you tune your map, tune with a particular octane and continue to run that.

My bike gets between 20-50 MPG depending on how I ride.

 

I could see this making a bit of a difference...greased verses ungreased. plus riding ungreased could probably lead to bearing failure. Also, fresh oil/grease could make a difference over old oil/grease, as well as synthetic verses conventional lubricants

 

I'm always surprised how some of you guys get 40+. I got a 06 & the only time I saw 40+ mpg was on my first few rides in 06, after that I've always got 30-33 mpg on my daily commute 50/50 city/freeway.

Weekend rides usually give me about 25-28 mpg & the worst I ever got was about 21 mpg.

 

I have an 06 with slip on and K&N filter. and i get 40-45 almost every tank... lowest I've had was 30ish and that was a full tank of racing.

on a side note. I use 91+ octane because it is not Oxygenated. I haven't rebuilt a rocket before but i have rebuilt high performance snowmobile all the time and for that you need non-oxygenated gas because of the high revs and compression... just figured it would be the same for a high revving bike

 

I'm suprised nobody has asked about the tires..
I'm assuming you run pilot powers (or similar street tires); what is your tire pressure front and rear? I ran into an issue where my fuel economy dipped to the low 30's for regular riding, turned out after I had lent my brother the bike he dropped the tire pressure for some more aggressive riding and never brought it back up, it was at 27 front and 35 rear, vs. my usual 36/42 for sport touring/commuting duty.

02 F4i, Yosh pipe, stock air filter.