I just wanted to add a bit on CVTs and clarify they are NOT infinitely-variable-transmissions as the marketing would like you to believe, they are continuously-variable-transmissions. Whats the difference? An IVT would have to be able to expand and shrink the spools that the drive chain runs on and be able to do this infinitely. A CVT actually is only infinitely variable on a continuous scale between the max and min ratios so if the range is from 3.5:1 to .6:1 the CVT can only run ratios between those points.
Also CVT is not always best for the job look at the 2005 Ford 500 the CVT was marketed as being more efficient and having better acceleration than the same car with a automatic 5-speed transmission and thats why the other transmission option was a auto 6-speed that had better MPG and acceleration not by much.
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