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I was looking in the fuel log of the 1981 VW rabbit that my grand parents bought new and they would often get 58 to 62mpg, but I'm sure they were also driving 55mph and never drove less then 15 miles one way, the car had over 160,000 miles on it before the factory starting battery or brake pads/shoes were replaced for the first time, but then again they bought the car because if they were going to drive some place it was a distance.
I know that the alloy GTI wheels are heavy, but I wonder if more modern alloy wheels would fit (VW used wheels that centered on the hub, instead of with the lugs, I think, fact check this) but if you can get lighter weight 14" wheels then you have options for low rolling resistance tires.
Also, the transmission oil is most likely 31 years old, unless you've changed it, a synthetic GL5 gear oil in there might make things move a little smoother.
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