because the engine has to push more to overcome the wind resistance. i heard that something like 20% of the fule that rigs burn is overcomeing wind resistance.

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81' 300SD AKA "Big Helga"
84' 300D Euro spec (Veronika)
85' 300D NonCalifornia (Heidi)

"We shall not fail or falter; we shall not weaken or tire...Give us the tools and we will finish the job."
-Winston Churchill, 1941

"I'll have a Chinchilla!"