The rav 4 and any commuter based car will get better mileage due to gearing.
On my SVX I could turn 28-30 mpg easily on the highway at 75+ mph. My sti would get 17-18mpg at those speeds.
The issue is that final 5th or 6th gear ratio. On a turbo Subie it turns 3500rpms or more. On my 335 at 80 it turns 2500rpms with 300hp and gets 26-27 mpg at 80.
Most toyotas and gm cars turn very low RPMs in the top gear and get great mileage.
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