will a 160 thermostat lower gas milage? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

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Old 11-14-2007, 09:10 AM   #11
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With your mods, if it were my car, I wouldn't.

The PCM will take too long to warm you up and fuel mileage will suffer. Fuel enrichment mode takes quite a bit more fuel.

This time of year in your climate, a stock 195 or undrilled 180. Summer time a drilled 180.
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