Hello all. I have a 94 LS and have noticed that i don't get good gas mileage. So i did tune up, oil, air filter, plugs, psi check. After i drove with full tank and it was almost on empty, needle barely over E mark, i pumped full tank which was 9.5 gallons and only 205 miles of driving. Now integras tank holds 13.2 meaning that while almost on E, i had over 3.5 gallons left? Could that be right? Any in sights will be appreciated.