How's it been for anyone driving a street rod or pickup with the 5.7 Hemi and a six-speed automatic trans? I plan to have a 3:55 rear axle ratio behind a 65RFE trans in my 56 pickup build and goal is to get better than 20 mpg on the highway at 75mph/2000 rpm. Is that realistic for anyone out there running a 5.7 Hemi? Plus, just say "yep, got a Hemi" still counts to me being a long term Mopar guy.
My 6.4 I built for my 3/4 ton can get close to that, a 5.7 in a much smaller vehicle should easily do that if done right. My old 2011 1500 with a 6.4 and MDS would hit 20 MPG after I put on a vararam.
