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Your right, your short trips are really bad for testing in the winter. On long trips I found that not coasting while the engine is cold in the winter is good for 4 MPG on a long trip.
I don't know about this year, but last year the rules said no added pans forward of the firewall and no splitter further back that the front of the tires. The front of my pan was going to rest on the back of the under engine pan. Plus I am probably going to race under a pure stock class.
I am also one of those strange people who use their Mustang for driving long trips in the snow. A full belly pan should help with deep snow also.
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