I think my RC does very well with mileage. I fill up with 3.8 gallons every time and go anywhere from 127-135 miles, depending on how much I play around. I have a turn one, full akra, and PCIII with PC map.
If I drive the canyons I get around 112-117.
I use 91 oct. and most of my riding is highway and very large interval between stop lights. I plan to go 15/41 soon and hope to maybe get a little more mileage but we will see about the
2001 #62. Ohlins rear/valves, Micron high mount, HyperPro damper, SharkSkinz, Tyga billet triple clamp, Tyga Carbon Fiber fender and hugger, Ti bolt/custom subframe/alien motion 8 cell diet, 15/41 520, COP conv. PCIII, Venhill lines, modified air box, turn signals in headlights...<deep breath> ZG Touring windscreen, Tech G rear sets, CRF450 rear master w/HRC cover, Tokico 6 pots w/V-pads, CRG Bar end mirrors, PSR Shorty levers-use only clutch, wanna-be basic racer paint, Roman Gold PC wheels