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I used to own a 73 El Camino with 350 and 2 BBL carburetor. It was terrible on gas and this was long before I had knowledge of modifications for mileage. It was easy to trade it on a small Datsun truck and gain some easy mileage.
With the age of a vehicle from 1971, one might also want to investigate the condition of the wheel bearings. Synthetic oil in the motor is always a good way to kick up the mileage with just an oil change. An underdrive pulley kit might be a easy way to gain some mileage. Get rid of the spare tire and big heavy jack to loose some weight.
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