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I run engine blankets all year; they help reduce cold starts which are the devil for fe and emissions. They're even better when paired up with grille blocks.
I've read from a few different sources that 1000-1200 ft/mn piston speed is where optimum rpms for fe are. If you can find a BSFC chart for your car that's even better. On my vehicles the piston speed converted to mph and rpms usually gives me a range between 42-52 mph for cruise speed. Another source- which agrees with ^, says don't exceed 2000 rpm for fe max.
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