Right foot is the biggest factor in MPG. All city 15-17, mix 19-21, all highway 27-30.
I'm 40\60 cty/hwy. Drive normal, avg. 25.2mpg, heavy on the boost, 22.7 mpg, long highway tips 28.8 mpg. My avg, mpg is 24.6 for my 120 daily commute.
Mechanical part that can effect MPG's, bad, dirty or worn out, MAP sensor, air filter, fuel injector, spark plugs, coil packs, O2 sensors, CAT's & your tune that you're running.
Original Motor/VF-40 Turbo/15k OCI, Amsiol 0w-30 SSO & Ea. oil filters. Tuning Alliance Stage 2+, 18.5psi. Member; 200K + club. Currant mileage:248105