We, a family of five with total weight of about 700 pounds, piled into the 63GT yesterday for a 180 mile round-trip. Of course we had a wonderful Thanks Giving dinner at the destination with family and friends. Our speed averaged 65-70, and about 75 per cent of the trip was on the Interstate, with the remainder on Kentucky back roads. We gassed up when we left home, and again upon return, and the same gas station & pump. MPG was 18.2. To help increase MPG from the car's automatic tranny, I have installed a 3.07 rear end, with a "baby Holley", 450 CFM 4-barrel "economizer" carb. I know some have gotten 25-30 MPG from these cars, but I think 18.2 is about as good as it is gonna get for this car. Only thing that may have helped get a little more MPG woulda been to have left the 500 pounds of family behind, but of course that ain't gonna happen.
I thought a good example of stock Stude V8 MPG was inadvertently provided by an ebay seller about a year ago. In listing a 63GT from California (automatic tranny), with about 75,000 miles on it, he included a scanned copy of a meticulously maintained maintenance schedule from the 1960s thru 1980s for that car. The records included miles & gallons, for each and every time the car was gassed up. I did the math from that schedule, and noticed the car never got better than 16.5 MPG. It probably had a 3.31 rear end, and I don't recall the carb it had. I recall it had a Powershift tranny, and PDBs. The reason I paid so much attention to that car was because, being in the market for a 63GT at that time, I almost bought it.
I thought a good example of stock Stude V8 MPG was inadvertently provided by an ebay seller about a year ago. In listing a 63GT from California (automatic tranny), with about 75,000 miles on it, he included a scanned copy of a meticulously maintained maintenance schedule from the 1960s thru 1980s for that car. The records included miles & gallons, for each and every time the car was gassed up. I did the math from that schedule, and noticed the car never got better than 16.5 MPG. It probably had a 3.31 rear end, and I don't recall the carb it had. I recall it had a Powershift tranny, and PDBs. The reason I paid so much attention to that car was because, being in the market for a 63GT at that time, I almost bought it.
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