By Frank Hovis
They've been puffing one on the radio this morning, "Lightfoot", that will tell you when you're driving efficiently.
Surely that's what your rev counter does?
For diesel 1,750 RPM is the optimum or sweet spot and for petrol it's 2,500.
Beyond that don't accelerate hard or keep slamming on your brakes.
Yet another solution looking for a problem.
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