A corvette zr1 has 638 hp and will go a little over 200mph
Hot Rod magazine has run a 1980 camaro at land speed events, it has similar aerodynamics to yours with the exception of the wing. It went 246mph with a normally aspirated 572/720 GM big block crate motor, and 260 with a 150 shot of nitrous. It is admittedly a guess, but given the above knowns, even in your high drag configuration, you should reach 200 using only 800hp.
I picked 800hp because that seemed a conservative number for your car to reach 200. Your motor has been on the dyno, so you probably have the actual BSFC numbers for it. Those numbers will tell you how much fuel it uses at a particular HP number in 1 hour, ie BSFC units are lbs of fuel per hp-hr. Those numbers for just about any engine, NA, turbo or supercharged, are typically in the range of .3 to .5 .
It is therefore a relatively simple calculation to see how much fuel the engine will require over a known time period at a known HP output.
Fuel in gallons required = ((hp*BSFC)/(6lbs per gallon))*hours
I used .3 in the calculations by mistake, that would be on the lean side( I said I hadn't had enough coffee). Re-calculated using .5 the number would be approximately 25 gallons, which actually correlates much closer to the NASCAR numbers. There is certainly nothing wrong with carrying 45 gallons of gas in an unlimited class, it eliminates one more thing to worry about on race day. I was just trying to point out that if you needed extra room, you could squeeze some out of the tanks real estate.
The car looks great BTW. I am glad to see it being built with such a capable cage and attention to safety detail.
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