Quote:
Originally Posted by Locust
When I had a co-driver for several years we tracked it at about 0.3s difference for a 200lb passenger. So every 1/4 tank of fuel you're around 20lbs or 0.030s. In street class these cars can run a full 4-run event once the gas light comes on except at high grip sites like Crow's or Lincoln. In STX trim or higher I would keep it to between 1/4 to 1/8 a tank.
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Not all weight is created equal, your problem there is the wrong passenger. I had a friend that had a passenger seat in his EMod car to take "babes" (his term) for ride alongs, he said he went about a half second faster.