Just bought a 88 RX7 Convertible

[88quick7]

Hey whats up? My names Bill and i Just bought a 88 RX7 Convertible , that can also be a targa , with the stock mazda BBS style wheels , 20k on the rebuilt motor with a new tranny clutch and drive train , car is white and clean enough to eat off as well as the interior, a true gem. Ive had a Porsche 944 before this car and i must say the mazda handles better , and is faster. I had a few ?'s though whats do the average MPG on these? Any what are critical things to keep up on with these cars to make them last , also whats the best weight of oil to use. Anyway to get a little more HP out of them?