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I'm running a 383 with a performer rpm and a 750 quick fuel double pumper. With a t-5 tranny and 2:73 gears, along with a lot of carb and vacuum advance tuning I'm getting around 24mpg on the highway at 65 mph 1800 rpms or so. Now my average around town and daily interstate commute of 60 miles Im getting on average 20-21 mpg, but that can go way down if I put my foot into it, which I am often temped to do. I am actually thinking of going to an 850dp and I don't really expect my mileage to drop off very much either. The biggest improvement I made as far as mileage is concerned was dialing in my vacuum advance. I was averaging about 21 mpg the highway and tuning on that vacuum advance brought it to 24 and greatly increased performance while cruising at low rpms in 5th gear and it idles tons better. Thats just my $.02 on this.
Seth
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