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Re: Gas Efficiency
Cold air will reduce fuel economy. But through characteristics of the throttled petrol engine.
The throttle in a petrol engine causes large parasitic losses, it reduces the amount of air entering the engine by creating a pressure drop.
Colder (denser) air means the throttle has to be closed further, causing a bigger pressure drop for the engine to suck against which impacts on fuel economy.
Igovert covered well the basic steps to better fuel economy. Bolt ons are BS. If they worked then they'd be standard on new cars.
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