03 fatboy only getting 32mpg????
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Tourer
Joined: Jul 2010
Posts: 291
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From: eastern nebraska
03 fatboy only getting 32mpg????
My stepdad just picked up an 03 fatboy. Stock carb and hooker exhaust. From what i can tell everything else seemed stock. It didnt sound to me like it had cams. He is only averaging 32 miles per gallon. What do you think? Could it have a big bore kit? Still if it did, that seems low for a harley. What do you guys think?
Road Master
Joined: Aug 2010
Posts: 1,067
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From: New Hampshire
If the carb is tuned properly and the ignition is correct and the air filter is clean, then his riding style it the number one influence gas mileage. My 03 Heritage (EFI) gets about 34mpg when I'm getting on the throttle a bit to much and that zooms up to 42 mpg when just cruising around.
Club Member
Joined: May 2007
Posts: 145,895
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From: 40 miles Northeast of Indy..
Thats low for sure if all is well, meaning no missing or any other issues.
A carbed bike usually get even better mileage than the FI'ed ones.
42-50 is not unusual,
Another thing is if its got cams and even a BB kit they also usually get better mileage than the stock motors... Also depends on the Twisting of the right hand.
My mileage went up 2-3 when I did the stg1 and then another 2-3 when I did the cams.
When mine was new I got 37-40, now I can get 44-46 most all of the time on the road and 41-43 in town.
The worst mileage I can remember was 36 and that was right after I had the cams done, seems like the throttle was stuck open at lot on that first tank when I got her back..
..
Also any stock bike should get better mileage after the motors broken in really good which is at least 5k.
Actually my bike seemed to run better every Yr for the first 3 yrs or up to 25k.
Another thing is Ethanol gas and colder temps will lower Ur mileage, 10% lower is not unusual.
.
A carbed bike usually get even better mileage than the FI'ed ones.
42-50 is not unusual,
Another thing is if its got cams and even a BB kit they also usually get better mileage than the stock motors... Also depends on the Twisting of the right hand.
My mileage went up 2-3 when I did the stg1 and then another 2-3 when I did the cams.
When mine was new I got 37-40, now I can get 44-46 most all of the time on the road and 41-43 in town.
The worst mileage I can remember was 36 and that was right after I had the cams done, seems like the throttle was stuck open at lot on that first tank when I got her back..
..Also any stock bike should get better mileage after the motors broken in really good which is at least 5k.
Actually my bike seemed to run better every Yr for the first 3 yrs or up to 25k.
Another thing is Ethanol gas and colder temps will lower Ur mileage, 10% lower is not unusual.
.
Last edited by oct1949; May 8, 2012 at 10:24 AM.
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