Welcome to EM! It's funny, I just started a thread about old school engines and fuel economy, and the combo that inspired me was the Turnpike Cruiser Oldsmobile package from 1967. That big brick was getting 20+ mpg back then.
Do you have the stock 307 HO motor or did you swap in something else?
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Volvo WIA42 VED-12 / 335 hp / 1300 ft/lbs / 9 mpg
Big n' Boxy, Never met a Hill it Didn't Like
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