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Block heaters are good, but remember about their electrical consumption...
Putting a heating pad on the trasmission (as freebeard mentioned) and/or on the oilpan will supplement the block heater.
Block the grille so that the wind doesn't keep cooling the engine.
Also, thermally insulate the engine, so that it doesn't cool off too much while you are shopping.
If it is just a few miles, then cut heat or A/C. In fact, even the seat and steering wheel heaters WD40 mentioned will probably impact engine load more than your comfort.
If you have a plug-in hybrid, then keep the speed low, so that the electric assist has a larger share than the ICE.
Last, but not least - If it is not far, maybe you could bike there?
Or maybe plan a shopping carpool with a neighbor?
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is where you're going, not how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread
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