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Arithmetic central...
A popular guess is that the drive train absorbs 15% of the power, so if you divide the net 300rwhp by 85% you will get the gross of 353. You can't just add 15%, you need to add 17.65% to get the gross. The test is 353fwhp x 85% = 300. So either divide by 85% or mark it up 17.65%.
 
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