A number of people came over to let me know. I didn't think it was as bad as some were saying because the car wasn't using much more fuel than normal. Looking at Sean's R4 video it was quite a lot during the long left hander before the front straight.
First we thought it was a clogged vent line from when I went off early Saturday. After inspection the vent line was fine, but the problem seems to be my exhaust (without turn downs) which was heating up the gas tank. This will be changed before MSRC as well as a new gas cap.
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