42 to 45 mpg Stock except Rush Slipons. Usually 60to75 mph.

 

AutoXR, you might check 'where' you are getting your fuel. There are a large number of stations around the Denver Metro area that I will never use because I know they have CRAP gasoline...and others where I know the gas is pretty good.

That said...31mpg? Wow...that really sux!!!

 

08 RKC(no longer the owner of) and 08 Street Glide: I kept both stock with original IEDs and never got better than 38 mpg on either.

 

These guys getting 50 miles to the gallon must also be the ones getting 20 thousand miles on a rear tire

 

Lot of talk on this subject. I averaged 41 mpg on a 4500 mile trip from Seattle to Alabama in September. Cruised one day on I-90 at 80 mph most of a day, got 39 mpg. High of 50 mpg and low of 38 mpg on the trip. Took a 750 miler a couple of weeks ago. Avg 40 mpg. On one tank I tried running in 5th gear, mostly highway @ 70 mph, got 37 mpg. ( see sig) All of this was with two up. Ultras aint the most aero of machines.

 

00 Electra Glide Classic
Stage one kit
Power commander
True duals
SS510G gear drive cams

On long trips I get 40-42 on the highway if I stay out of it. 75-80MPH

 

I agree with the 6th gear thing, tech told me the gears are set up on the motor for 65-70 MPH in 6th gear, if your not doing this speed your lugging your motor.

 

We average between 42 and 44 on a 08 ultra with rush slipons,stage one breather and map. This is mostly two up riding. 50/50 town and country Our gas mileage went up after breakin period. One thing I've found to kill mileage is gas with ethanol 2 to 3 mpg. Noticed this in the car 07 mustang, van 99 dodge, and the bike.

 

I notice you are from NJ. So am I. In the summer I get 41 - 46 mpg.
As soon as the cooler weather comes, my last tank was at 34mpg. I've been as low as 31 in winter.
I think it's a combination of the cooler weather making it run richer and the additional ethanol they add for cooler weather.
I have an '06 SG with SE air and slip-ons. 16K on the clock and the bike acted this way from the get-go.

 

43-46 mpg average....bone stock 02 EGC. 27,000 miles
thats in town or hwy. usually ride under 75 mph.