Yeah, Jack said it! Don't be obsessed with the readout, check mileage off of the odometer at fill-ups. Keep in mind that you'll have some variation in filling up the tank, it never stops at exactly the same volume every time.
I can average about 13 mpg all week, and then take a short 30 mile run (with a lot of hard acceleration and cruising above 65 mph) and see mileage readout jump to over 17 mpg. Then if I check off of the odometer at fill up, I can see mileage drop to as little as 11 mpg.
From that I'd conclude that readout is a good indicator of driving style or type (city/highway).
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Current mods: AEM Bruteforce CAI, Magnaflow SI/DO, Gryphon-87 & 93 tunes, Harley head lamps, tinted windows, lower grille filler, and FX2 lower valance.
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