Quote:
Originally Posted by njn63
For better fuel mileage you want to retain heat in the engine bay and increase IAT's. I was reading about one guy swapping in a 193 degree thermostat in place of a 173, warm air intakes picking up 3 mpg on Saturns, so weird. I've spent so long trying to reduce them that it's almost a challenge to think about ways to do the opposite.
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That makes sense though. Cooler air is denser than warm air, so if you've got more air going into the engine you need more fuel to maintain a good stoichiometric ratio. Let things heat up and you'll lose power but use less fuel.