I keep a gas log in my saddlebags on my 05 springer classic EFI with K&N filter. Average is around 45, best I've gotten is 54.

 

02 Heritage, 88b, stage 1, windshield, tall t-bag and duffle, me - 240lbs, avg 72-75 mph, interstate. I am getting from 38 to 45 depending on terrain and wind.

 

'01 FXST, SE Hybrid Cam Plate, SE 253 cam, velocity stack from CV Perf, SE II slip ons - Get 53 -54, mostly back roads in Blue Ridge Mtns, lotta shifting

 

2011 Blackline 96", Rush Slip-on's, Stage 1, HD Download. I get on average 49mpg in town back and forth to work everyday (Freeway and City combined). Best ever was ALL Highway 54.2 Ridin 2up. BUT that was keeping it around 65-70mph down small back highways. Cruisin 80+ solo all highway it averages 50mpg on the norm. Lowest I've ever seen is 48mpg with minimal freeway.

 

2012 Fatboy Lo Stock = 43.1566 MPG

70% freeway