^^^ What rmay says. Regardless of the torque curve, doubling your speed roughly quadruples your power requirements, and wastes much more fuel. If your TC locks at 65 kph, you're better off driving 65 kph in your 70 kph speed limit areas. 
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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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