Personally, i think 440's just suck in this dept. compared to other makes. I haven't owned them all, but i've had a few 440's, some were nice runners, good tune and car etc. They all got [Edited by Moparts - Keep it clean] mileage. My Charger with its stock 76 440, full (very nice) exhaust, elect. ign, de-optioned (as in no power anything) and no air cleaner even gets around 8MPG. Thats with 3.23 gears and i know how to drive for mileage.

I've never had a 440 in anything that could touch my 68 Cadillac's mileage, and thats a high-comp 472 in a 6000lb car with all kinds ov problems.

I blame the lack ov quench more than anything. My Caddy has it, my Charger (and other Mopars) never had it. Mopars just aren't efficient from the factory in my opinion. You need to rebuild them and buy some real pistons.