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Just keep in mind LiFePO4 doesn't tolerate charging below freezing, so if you plan to use it in freezing temps it would be better to locate the battery inside the vehicle. This would probably require using a supercapacitor bank in the engine bay to provide the CCA the starter motor needs. You could downsize your battery if you go with a LiFePO4 and super capacitor bank. What is the electrical draw while the engine is off?
You'll probably never tell the difference in MPG though.
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