Horsepower with mileage options

Calculations like those, while down to earth and hit the mark, will usually take out the fun in driving a car and upgrading it as you go along.

I had (still have) set similar goals with my own '73 Dart.
Being a daily driver for me, every upgrade I did over the years, made for a more fun to drive car in the process.
Unfortunatly my car has showed me it doesn't like to 'mileage' well at all and improvements if any have been very small, compared to the money spent, but the car is sure much more fun to drive than when I first bought it.