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Hello and welcome to EM,
I would start with a baseline coastdown test to "calibrate" the spreadsheet values, for the tire rolling resistance, etc. And tuft tests to find the problem spots. What is the stock Cd?
You need a full belly pan, rear wheel skirts, and smooth wheel covers. You'll have to work on ducting the cooling air flow through te engine compartment. Does that chin spoiler stick down a lot below the bits on the underside?
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