I have read, either on here or on another hypermiler forum, that to squeeze out that last little bit of MPG, the hardcore hypermilers drive barefoot to feel the pressure on the accelerator more accurately.
You also said you started wearing shoes because it got cold. They say on here that it's pretty well accepted that a car will get less MPGs when it's cold (thicker oil, longer warmup times means longer time with rich fuel mixture, heater/defroster fan uses electricity, making the alternator work harder), etc.
And I've also read on here that new tires tend to get worse MPGs than worn ones - more rolling resistance with all the tread, and also older tires tend to get harder with age.
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