If you ran a full tank would you be able to hit the minimum weight? If not, I would run as little as possible. If you run ballast I would think you would get better weight distribution with the fuel towards the back than you would with ballast in the foot well.
I also don't think at this point you would notice much handling differences of 8-10 gallons of fuel.
Jeff L
ITA Miata
2010 NARRC Champion
2007 NERRC Championship, 2nd place
2008 NARRC Championship, 2nd place
2009 NARRC Championship, 2nd place
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