[Hal Copple]

can't say about mpg and the Roush motors. But in my own car, a 392 Windsor, with 15 inch wheels, several different Tremec and varying diff ratios, i find my highway cruise, at about 70-80 mph, to be around 14-15 mpg at best. In mostly town, perhaps 10-12 or so. Once, had to drive a long distance on a fresh tank, in pouring rain, and due to the risk of hydraplane, and not having much vision, driving very cautiously at about 50 mph for several hundred miles, i was suprised to get 21 mpg!.

Before you do your own mpg test, be sure your speedo-odo is accurate!! I can pull a safe 200+ miles out of a tank of 93 octane. My bladder can't do that, though.

all the best,