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Sixt rental cars in France hasn’t been doing manual transmission cars for years - automatics get better gas mileage and are actually better on overall emissions (you’ll notice modern manual cars keep the revs up even when you let off the throttle). Germany has followed, I believe. But you’re right, it’s probably those dumb Americans’ fault.
I didn't notice this auto-revving behavior, however. I was driving a Ford in England, so maybe they don't have this "feature."