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Remember, a OBD gauge is never going to be accurate to within 2%. The biggest thing that will throw it out is a change of driving style.
Pulse and DFCO doesn't work, even on cars like my Trafic (tiny diesel- heavy vehicle) where I can't even tell if I'm gliding in gear or neutral.
Pulse and gentle throttle may work. It works for Hybrids and it works for diesels, but I have feeling for a typical petrol car it may not - you're operating at max pumping losses that way - which is contrary to the whole point of P&G.
I don't bother with P&G on the highway - you'll have the same results just sitting in the slow lane.
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