earlier today I started the truck and it idled cold at around 1300 rpm, when i switched on the fan to full it dropped at least 100 rpm, so a bit of load there, could that change the mileage a bit to run with only normal draft air and no fan, should be about 1/10 HP difference if the fans on high . some one else posted something about this somewhere. and Happy new year Guys and Girls . May all your trips be downhill and downwind.
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