jikelly said:Gee that seems really low. What intake, carb, and cam are you using? What was your mileage before the supercharger was added?
I had a performer intake, holley 650 double pumper, and an edelbrock rpm cam, stock 289 heads. The engine had over 100,000 miles before the supercharger. The thing with the supercharger is you up your primary and seconday jet on the carb. I think it was 72 primaries and 80 Secondaries. The carb ran rich at lower rpm, but would lean out in high. It could be tuned better but I was having too much fun. The fuel pressure rises on a 1:1 ratio with the boost pressure too. Before the supercharger I was running a holley 450 and averaged just under 20mpg on the highway.
...darnit that reminds me next check ill only have like 150 for me, need to get a graduation present for an ex (trying to get back with her