My results are far better with P&G than with DWL, even at painfully slow speeds on the freeway that i found to be almost dangerous. With the combination of accelerating at known optimal BSFC levels and high tire pressures/aero mods/drafting for improved glides I am easily able to beat 40MPG on trips where DWL was in the mid-high 30s at best. My personal best was 54mpg on a trip while P&G drafting a truck at 50-55mph.
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