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On the autoroutes 130km is fine, and you can do it for hundreds of km without slowing sometimes (three Christmases ago I drove from Calais to Le Mans without seeing a single other vehicle).
Péages are too much of a slowdown even with the Bip&Go tag. I once got chased by the police out of one when I roared out of the gate and shot up the motorway past everyone else. When they caught up and I was quietly doing 130 in a queue of other cars they kept going for a bit and then turned the sirens off.France is huge though, and 130 is only 80mph. I wish the limits were higher. If you’re heading to Italy, Switzerland or Austria going through Germany is so much faster.
70mpg, 80? My god. I reckon thrashing it was still more economical than being in a traffic jam, but it would have been in the teens. Still what else do you earn money for except spending it on things that make you happy? I used to feed it petrol like you feed a dog, saying “good car, we’ll done. Have some more lovely petrol.”
My current Citroën C5 tourer can do 1200 km on a tank of diesel. It’s a very different world!