Thread: Gas mileage on my 66 1500
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Old March 6th, 2023, 05:43 PM
lizziemeister'sV6 lizziemeister'sV6 is offline
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Join Date: Aug 2013
Location: Strawberry Point, Iowa
Truck: 1965 Suburban Series 1000 - 351M with mechancal tachometer - PS & PB & 2 speed Pow-R-Flow automatic
Age: 70
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Default Re: Gas mileage on my 66 1500
Are you running a 350 engine like you stated? Guess that's what we need to know first - is it a GMC V6 305 or a GM 350 V8 as you stated? Anyway - the mileage you are getting now is proof that there's a major tune-up needed - in either engine.
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