Looks good, hurts MPG's - Mercedes-Benz Forum

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post #1 of 5 (permalink) Old 10-08-2011, 07:20 PM Thread Starter
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Looks good, hurts MPG's

1. Larger wheels (with smaller sidewalls and wider tires). Prius owners who upgrade to from 15's to 17's loose 5mpg. Why? More rolling resistance and more weight. The shorter sidewalls also give a harsher ride--they are only good for corners.

2. Grills. A modern car can cool fine without them--and they are one of the biggest sources of drag.

Anything else to add to the list?
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post #2 of 5 (permalink) Old 10-11-2011, 02:06 PM
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Sure, wings and spoilers.

BTW, the only cornering that's improved by wider tires is dry road cornering. Wider tires equal less traction always in wet or snowy conditions.

Kent Christensen
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post #3 of 5 (permalink) Old 10-11-2011, 02:54 PM
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I experienced about 5% mileage drop when my fan clutch bearing froze and I drove with fan on for 1000 miles. So when you make smaller grills, you will need more fan power. That will not end with savings.
Myth Busters did some tests with one of the econobox.
The test was started at high speed and continued without changing the speed till the finish mark, so it was test for drag only.
Adding 900 lb of clay to smaller car did not change mpg at all, but making dents on the body similar to golf balls increased mpg by 11%.
Such a car covered with dents might look funny, but sure made me thinking.
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post #4 of 5 (permalink) Old 10-11-2011, 03:03 PM
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post #5 of 5 (permalink) Old 10-12-2011, 06:08 PM
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Next time there's a hail storm, pull your car OUT of the garage. ;>)
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