NASCAR 09

Anyone know of a great way to determine fuel strategy?

I just raced Daytona on the Hard level on 20% with wear on 2X and I had to pit once. I pitted and took right side tires and 1 can of fuel. Turns out I needed to take 1.5 cans. All my stats are 100 overall.

I was the only car to run out of gas.

I went into the stop in 1st with a 6 second lead and came out with a 9 second lead and knew that was not a good sign. That was with a lap over half the race finished. So I was guessing and thought I had it right but I sure didn't.