3g hemi gas mileage

What computer are you running? I have a few different fuel mileage numbers from my experience so far, but I'm not even fully dialed in on my tune yet. When I had my Hemi carbed to start with it was getting between 13-16 depending on what jets and rods I was trying out that day, but I couldn't get the top end out of it I wanted. I just switched over to fuel injection and during initial tuning I saw 6, lol. But most of that was spent running in the driveway or wide open throttle trying to get different parts of the map tuned in (running a Megasquirt). The last tank I put in I was up to 12-13, but I've been having trouble with my accel enrichment kicking in because of a noisy TPS signal. Just got that sorted out, but don't really have any runtime on the car with the fixed signal. GDemon has pretty much the same combo as me (5.7, non O/D 833, 3.55 rear gears) and he got 20 on the highway over a full tank, so that's what I'm shooting for. Talked to a guy at a show with a 74 Cuda that did a 5.7 swap and he was in the same ballpark of high teens low 20s. I think my tires are around 26" inches tall right now and I cruise 70 around 3k rpm or a little over. I haven't weighed my car after the FI swap, but after the Hemi swap I was coming in around 3250 with me not in the car so I don't think it has changed too much.