Depends on the track. No issues for me at LRP and WGI, but I did experience what you describe at Thompson in NE CT which has a bunch of nasty high load turns and was down to ~1/3 tank. Baffles in 2011 allow much easier tank fill than my 2010. Came in from a session at WGI with like 1/8th tank and no issues. A long straight after several nasty turns may be your culprit.