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Okay just ran some numbers with my Lamborghini example...
The Aventador has 7L, and spins at 2860rpm at 60mph. A Toyota Celica GT-S had about the same rpm for 60mph, but with 1.8L. This means we're asking the mighty 7L engine for only 1/3 of the torque that we're asking of the 1.8L engine, which is IIRC less than 25% of its available torque. The Aventador then is running at <10% peak BMEP...I think it's possible that 70mph could be better than 60mph in this car, despite the higher power requirement, because the engine efficiency is so much higher.
I don't know why people ignored my example, because the OP did ask for cars that got their best mpg at higher speeds.
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