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You don't use that as a commuter.

When did that change? My 5.7 said to NOT use premium.

Not everyone can simply ignore reality and drive a car that gets 7mpg on premium.

I just bought a Duster. (Insert happy dance here.) It seems to be a stock Magnum long-block with a Holley QF carb on an RPM Air Gap intake, headers, Hughes cam kit with 1418ALN-10 cam and roller rockers, about 9:1 compression, iron Magnum heads. Considering this, will this run on 89 octane? Or...

Maybe another idea...check FB and the like for someone selling a beater truck cheap. Yank the motor, pull what parts you need, scrap the body, you'll probably have the motor for almost nothing. And you can drive it before buying.