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I have even noticed the difference in windows available for mixture strength control between my '92 Tempo and '94 F150; I run similar blends or even straight E85 in each, and they seem to run similarly on ethanol/blends, but the CEL is much more likely to light in the Tempo. I speculate that truck engines might have the ability to run a bit richer programmed into them for the cooling effects when they are worked hard.
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