I have never heard this before. The difference is that the "W" mode starts in 2nd gear and utilizes earlier shift points. Personally, I drive in W 100% of the time. I like the early shift points and gear 2 has more acceleration than i need.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record