POOR GAS MILEAGE

1970 GMC

Tiny

Bumpa

February, 1, 2011 AT 6:14 AM

Have 1970 c10 gmc p/u w/350ci v-8 & 4Bbl Holley carb & AutoTrans which gets 10mpg. A friend w/ same setup gets 20mpg. Both have 3.70 gears. Why? What can I do?

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