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filled my tank as full as humanly possible,and after about 20 minutes of driving it got as high as 429 dte while doin 45 in 5th. of course it was back down to 398 after i started the car later that day. just wonderin....
I've had slightly over 500 once or twice, high 400's several times. My trip home from Z Nats I believe I was averaging 30mpg on the highway, doing about 75mph the whole way home.