Figure the economics of meth vs C16;
$500 - Kit- one time cost
$4.50 -Meth per gallon x 10 gallons per season (2 events +a whole mess of track test days, plus the odd street war) = $45.00
So, the math- $545 for the first season, with ongoing meth of about $50/year. Only other fuel cost is for 93 octane. Car is 100% streetable, and in fact just passed emissions day before yesterday.
vs:
Race Gas
$6.50 - per gallon x 75 gallons season = $488. Car is streetable.
To me, the majority of us playing with these cars benefit more form the alky than chasing down race gas. Sure, the above #s can change, but the math remains the same.