Quote:
Originally Posted by McDesign
I do try to be as consistant driving as I can; always cruise control set at 69; exact same commute each week; traffic is light and never varies. Same two gas stations; same two pumps
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Other variables change as the months go by, though: your tires' RR is decreasing as they age & wear; ambient temperature affects MPG a lot as the seasons change (A/C use? Warm-up times increase as summer temps recede; numerous other impacts on RR & aero drag); fuel formulations changes around this time of year to the slightly less energy dense "winter gas"; etc.
Time passing is problematic for evaluating small modifications!