Toyota RAV4 Forums - View Single Post - Do you want 5+ MPG back during the cold months? Restrict air flow to the radiator.
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post #2 of (permalink) Old 01-06-2017, 10:42 PM
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5MPG is an exaggeration. While its true that radiator blocking helps maintain engine temps, on the Rav it will be more like 1-2MPG than 5. And it doesn't change the severe hit you see from short trips. A Prius might see that amount of increase on longer trips.
Also good to note that active shutters are mechanical, and a failure of that mechanism results in an un-drivable car.

2016 Hybrid Limited with ATP.

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