Today after spending $40 to fill tank I kept wondering why RWD volvo's have such a low mileage. To be precise, today fill up shows 18.2 gallon for 400 miles. This a little bit more than 22 miles per gallon with 80% highway driving. When the car is mostly driven by my gf who did 80% city driving, the gas mileage is around 17mpg.

I searched old posts and found my mileage is kinda normal. Maybe on the low normal range but still normal. Now comparing to my other cars, it is really low. My 1990 Acura Legend has roughly the same weight with the non-turbo 944 and has a 2.7L 160HP v6 engine . The gas mileage on freeway is 26mpg. My 1989 Toyota Supra non-turbo weighs almost 400 pounds more than the 1994 944, with a 3.0L 200HP I6 engine. The gas mileage on freeway is 25mpg. The Legend may have less power loss as a FWD car. But the Supra is also RWD, with significantly more weight, and almost twice the horse power, yet it still gets better gas mileage.

I am really confused. Such a low gas mileage really hurts with today's gas price.
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1994 944NA 100K miles