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Re: 73' Olds 455.
Honestly, if a 455 got about 12 MPG at all times I'd consider that about right in a truck and I would be happy to have even double digit gas mileage.
The best way to make these trucks get better gas mileage is to park them. Buy a cheap fuel efficient car, and drive that during the week. Fire up the truck on the weekends and have fun.
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1977 GMC Sierra Grande
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