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High vacuum is good for cruising and DWL whilst getting the most out of your car's BSFC is good for P&G. In an ideal world, P&G-ing everywhere would give you the best FE, however the practical realities mean that it isn't always possible. Therefore you should learn both when to DWL and when to P&G.
If your car is juddering/vibrating then you're shifting too early. This will increase engine load and spoil your fuel economy.
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Spoken like a champion. Oh no, disaster!
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