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Well let's be honest a tank like that aint never going to be frugal, is it. Driving style can make the sort of difference you quote. ease off your right foot, change down to slow down, use the brake only when you have to.

Check out the air filter for dirt or damage. Pump your tyres up just over the recommended pressure.

Make sure none of the brakes are sticking. Use low rolling resistance tyres.

I have a modern 2liter turbo diesel. It will do 120mph, 0 - 60 in 11 secs, cruise at 80 all day and return 48mpg average, over 50 on a long run.

Are you currently utilizing ethanol wherein you have been utilizing constant unleaded? Around right here all of the stations have switched to ten% ethanol and the mileage took a two to three MPG nosedive. Some vehicles react worse to ethanol than others. A gas pump will simplest impact your mileage by way of making your auto spit and cough and run tough. An O2 sensor can adversely impact it with out being dangerous sufficient to cause a verify engine gentle.

I would look hard at your air filter, and make sure you don't have dragging brakes, or something wrong with the transmission. You don't say how you drive, that can make a big difference. Also, you don't say what kind of driving you do, short trips, etc. Your vehicle should get between 10-16 mpg in typical driving.

I got a 1993 c-1500 with 4.3 v-6 o.d. auto trans. and get 17 .34 m.p.g. highway. At an average of 85 m.p.h. But thats a V-6 .

you say fresh tune up???what all was done during tune up and did you get bad milage before also or just after tune up?

isn't that what all american cars are like? get a golf