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There a lot of variables they all factor in, even a 25' difference in altitude would be a measurable factor. With an ideally functioning ECM system I could see ambient temperature effecting how long the initial warm up to "closed loop operation", while it's in "open loop mode" the engine is...

Hi Trek5000, There was no mention of which power plant you have, in general economy problems related to ambient temp I would first suspect the combustion chambers have not reached the optimum temp to properly "flash to vapor" the fuel pooled behind the valve head. Direct port EFI fires each...