I've got one of the big Thule boxes. Before I started hypermiling it cost me about 1 mpg, dropping me to about 21 mpg on a long trip. Today it would probably cost me a lot more. Maybe some day when I've got nothing at all to do, I can do some A-B-C coast down testing, measuring car speed at the mile marker signs. What's more likely is I'll put it on and take it to work for a couple of days. A, B and C will be on three different days, but my commute is pretty consistent.
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Originally Posted by sheepdog44
Transmission type Efficiency
Manual neutral engine off.100% @∞MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%
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