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I'm not really sure what sort of time you're leaving on the table, where's Andy Hollis to do a test? But if I was to guess, it'd be in the .1 second range when comparing low to full fuel. Low enough to be in the noise, but every advantage is an advantage.
I'll typically run it with the light on, and never had any issues with fuel starving. The biggest difference I find in full vs almost empty is the balance of the car. It shifts that 60lbs or so to the back of the car, and settles the rear. Could be a good or bad thing depending on setup, but I would try and keep it consistent across events.
What you don't want to do is have half a tank as you now have a mass of fluid sloshing around constantly changing the balance of the car. Run it almost empty or full.
I don't always get it right, especially for local events I'll sometimes show up with whatever is in the tank and do no planning ahead of time, but for national stuff, I do whatever I can to show up with low fuel.
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