Thats very true, what you could start with is a good service including an engine flush get all the crud out then possibly look at saving weight then look at handling, stiffening up the chassis, that way the power to weight ratio is changed for the better you save fuel as it is a lighter vehicle and it will go and stop a lot better.
look at changing the transmission and diff oil and put a friction reducing additive in there as well all to help the standard car run better.