One final point on economical driving. It is usually seen that the most economical cruising speed, to combine making decent progress with economy is, peak torque in top gear. Peak torque is about 2000 rpm, maybe a bit below. Which equates to whatever that shows itself to be on your speedo when in top gear. Any lower revs you can do and still stay in top gear without making the engine labour, will be even more economical. Sadly this does not equate to 70 mph. Closer to 55-60. But also vicious acceleration kills economy. I try to drive keeping one eye on the rev counter, especially when climbing hills. But the new, stupid speed limits in France kill your economy as you have no chance of locking up in an auto at 80 kph. Here again you can probably drive more economically in a manual car.