Which would give better fuel mileage during daily driving? Heard a lot of complaints about the e303 giving poor mileage. Just picked up a 89lx hatch Stock bottoms end 302, e303 cam, gt40 3 bar heads milled .030 with trick flow valve springs (stock rocker arms unfortunately) Msd billet dizzy, Holley 650 dp , victor Jr intake, bbk long tube headers Mac Pro chamber with flows . T5 with 4.10's aftermarket upper and lower rear control arms. Flaming river manual rack , battery in trunk , Holley electric blue fuel pump, no ac . Has stock springs front and rear right now but comes with eibach front drag springs and moroso rear trick springs. Has a brand new in the box f303 and was wondering if it was a better option since I will be putting quite a bit of miles on it every week.