89GMCJOHN
I'm Awesome
Spookers says :" Puked the motor and swapped in a stock 305 out of an 86 caprice with 400000 on the clock and instantly got 17mpg with my foot to the rug most of the time.
Though that's without towing a trailer but had a pair of 3 wheelers in the box from time to time and that didn't seem to change the mpg."
Only thing I can add is in fact my dad had an 86 carbd 305 Caprice as his daily commuter car for many years ..he always talked about how it got great mileage for what it was - 17 he told me many times ....I think the secret with that Carbd Caprice was its "whopping" camshaft Intake Duration 228 .351 Exhaust Duration 244 .385 so an old carb'd 305 can most assuredly put down 17-18 in stock trim...FWIW
Though that's without towing a trailer but had a pair of 3 wheelers in the box from time to time and that didn't seem to change the mpg."
Only thing I can add is in fact my dad had an 86 carbd 305 Caprice as his daily commuter car for many years ..he always talked about how it got great mileage for what it was - 17 he told me many times ....I think the secret with that Carbd Caprice was its "whopping" camshaft Intake Duration 228 .351 Exhaust Duration 244 .385 so an old carb'd 305 can most assuredly put down 17-18 in stock trim...FWIW
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