I believe the Insight's 75mph mpgs, but the Corolla does seem a bit high. With the direct drive system the Insight uses at higher speeds, the RPMs get higher than necessary at ~65+mph, dragging down the mileage even more. On the other hand, the Corolla's eCVT allows the RPMs to drop as low as possible. I've seen 1000-1200RPM while going downhill at 80+mph in my Prius. I wouldn't be surprised if the Insight beat the Corolla at a lower speed like 55-65mph.
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