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Careful with the immersion heaters, if the temp gets too high you'll coke your oil.
I have an unknown brand pad on the pan of my TDI and it's been there for 7 years without a problem, YMMV.
Temperature of the tires is not to be neglected either. Hysteresis if the main factor behind RR and it changes with temperature.
I do not have ambient temps for which this was tested, but Fundamentals of Vehicle Dynamics - SAE, reports a 20% difference in RR between a cold and warm tire. It took 120 miles to reach temperature equilibrium, 80F above starting temp. After 20 miles RR is ~15% lower, ~19% after 20 miles. I suspect that we run inflation pressures above which were used for this test, so it would take even longer trip distances for us to reach equilibrium and lowest RR. (search google for tyre_rolling_resistance_on_road.pdf to see full report and the figure I'm talking about here)
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