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Gearing, number of gears, and power curve can all make a difference. The current gen WRX STI has similar power to the Lexus and weighs 400 lbs less, yet gets 16/22.
The top gear on the Lexus is .59:1, which allows for better highway MPG. The manual BRZ is .77:1. Conversely, an auto BRZ has a 6th ratio of .58:1 and gets 30 highway MPG.
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