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well what happened was the temperature dropped to -15 deg celcius and i was pulling 21 mpg out of a daily commute i felt i needed to get at least epa 25, so i put on the grill block and 25 was achieved, then the temperature dropped again to minus -25 so i started plugging in the block heater and my start up temperature was 55 deg celcius enabeling me to pull another 5 mpg acheiving 30 mpg, i attribute 2 factors to my success ,, the end of the week my fuel tank was low better for FE in terms of weight, and keeping my drive slightly slower while it was minus 25, the thicker air is harder to push through,, less turbulance in the engine bay can attribute to a quieter ride
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