Yep, P&G works great whenever engine load is low. A powerful, aero and short-geared car will work best. An underpowered car and/or with very high gearing will work less.
My AX's engine, with its neverending final gear, it at 50% load (2000 rpm) at 56 mph and 72% load (2500 rpm) at 70 mph. That puts me quite in the sweet spot. I only P&G with a strong tailwind or on downhills >1%, enough to lower the load to make P&G interesting.
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