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Basically what it boils down to is that modern automatic transmissions do not have the huge losses that they had in the past, and the computer can select which gear to use for optimal fuel economy much more accurately than a person can without information like catalyst efficiency, A/F ratio, etc.
Yes gear ratios can play a part, but it's not the major contributor in this case.
Jeff
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2011 Lexus IS350 F-Sport 6MT with LSD
1986 Toyota Corolla GT-S Supercharged |