i love my V10 the most defficient engine ever made!!! i get 10 gallons to the mile what do you mean this isn't efficient?!?!?!?!?!? lmao seriously if i was worried about the mpg i more than likely wouldn't have purchased it, but it has proven itself i have put the shorty headers on it and i have noticed a BIG difference in the power, i'm going to work on a new exhaust system just haven't figured out which one i want to go with....miami what do you have and do you like it?