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mixed fuel

I would guess your drop in mileage would be related to "winterized" fuel. It has a mix of Kerosene which has less heat energy per gallon. I occasionally use a mix of jet fuel (kerosene) and notice a significant loss of mpg. Probably also the long warm up's from the cold.

Have you guys heard of a way to do the auto idle up like the ford's? Do any of the chips have this feature?
 
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