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How about a heating pad wrapped around the cat? It could take a few watts from the car's electrical system, which would slightly increase fuel consumption, but still less than normal driving or even idling, yet it would keep the cat hot (with some extra insulation). It could also be wired so that you could prewarm it block heater style, reducing the emissions from a cold start.
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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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