no gimmicks, i filled up full in austin, reset the trip odometer and drove exactly 108.3 miles to the gas station i filled back up at in college station. at that station i filled up exactly 4.45 gallons of diesel. that works out to 24.33707865 miles/gallon. cruise at 60. diesel kleen with fillup. mods in sig. light foot. that's it really. overhead trip computer said 13.1 miles per gallon, i'd be pissed if that's what i got unloaded haha.