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How is the current tune?
With a commute that short, it might not be making it into closed loop?
Have you tried letting it warm for a couple minutes, and then going? Granted that idling is 0 mpg, but it may get it up to temp, and the Mpg once warm may overcome the idling?
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Current MPG driver:
1994 Isuzu Rodeo - Beater with a Heater...
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