「Advent Chaos」
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Always wondered this, but does gasoline waste faster if you turn on your heater in the car? Some people say it's a myth, I feel like it really does.
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Atomsk, in a similar vein... I put a bike rack on my Prius. It took a 10 MPG nosedive due to the drag of my bike. I don't notice it on my 4runner.
So yeah, how the wind and aero treats you is quite important. Much more important than turning on the heat/AC.
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In a hybrid running the heater might affect your fuel efficiency. In a straight gasoline car it won't because unlike the A/C the heater is just using electricity, which the car generates anyway and generally has more than enough of. If you start using too much it won't make the engine run harder it will just make the electric devices dim/slow down/whatever.
In a hybrid, OTOH, using electricity to run the heater could take away from the electricity available to either run...
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In a hybrid, OTOH, using electricity to run the heater could take away from the electricity available to either run the electric motor or charge the battery, which means that the gas engine would have to run more to pick up the slack. Gas engine running more means more gas burned and worse fuel efficiency.
