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Ahh, the gearings not too bad. What are the revs at 70MPH? You didn't get that ratio on a '77 did you buy a 3rd member from and older car or did you get the rear end re-geared? When you re-geared it did you recalibrate the speedo? Maybe that's why your mileage is so bad. I was looking at a Vette and apparently it is a common occurrence to have one or more of the four tangs broken on the 3rd member's housing. That right there stopped me from buying that car.

What else have you done? When I first bought mine I had visions of rebuilding both the front and rear suspensions with the fiberglass leaf springs front and back and tubular a-arms and getting a crate motor so I could keep the so called number's matching motor clean. Instead I just drove it. Fun car, full replacement value insurance for $175 since it was a classic and I drove less than 4000 miles a year. In fact, I probably drove it less than 4000 miles all the years I had it. I'd still like to get an '82 limited edition fully loaded. I like the C3's shape.

I forget the gears on mine, it was in the high 3's. I'm assuming the 750 is the CFM of the carb and not the HP since over 2hp per sq inch is better than way good unless it's blown and on the bottle.

I had a 750 double pumper (spreadbore) on mine and still didn't get that bad of mileage and I treated the gas pedal as an on/off switch. Except for the carb though, my motor was stock with the 1.94 'fuelie' heads and either 2" or 2 1/2" exhaust.

Still I could live with 7mpg if I got the performance to match. I had a '90 RX-7 that got around 15mpg and was one of the slowest cars I've ever owned. It's the only RX-7 I've owned and I've owned many that couldn't take it up to 9000RPM.