Rather than mess around with doctoring up car, truck, heli, mystery fuel, just bite the bullet and purchase the supplies to do it right. I mix my fuel one liter a time in a graduated cylinder for the simple reason that the metric system adds up to 100. Figuring mix ratios couldn't be any easier than this way.
Yes, you will spend quite a few dollars up front. Shipping is among the big costs for everything now.
Some simple arithmetic will show that a single gallon of nitro will last most fliers a
very, very long time.
(I think I did the math correct)Even a thirsty PA75, drinking 8oz of fuel per fun
(run) would get 160 flights per gallon of nitro, mixed at 10%. At market prices, that is 50 cents of nitro per flight to feed that brute.
Per gallon of nitro, smaller engines running the same 10% mix could expect at least 250 flights feeding a (LA46)5oz tank, to 500 flights at (LA25)2.5oz tank.
https://www.ebay.com/itm/Torco-RC-Fuel-100-Nitromethane-Gallon/202402981614?epid=1162395718&hash=item2f202866ee:g:z28AAOSwe35bcv9g:rk:2:pf:01 gallon of nitro will yield 20 gallons of fuel mixed at 5% nitro. = 6.64oz nitro in a gallon of mixed fuel
1 gallon of nitro will yield 10 gallons of fuel mixed at 10% nitro = 12.8oz nitro in a gallon of mixed fuel
1 gallon of nitro will yield 6.66 gallons of fuel mixed at 15% nitro = 19.2oz nitro in a gallon of mixed fuel
1 gallon of nitro will yield 5 gallons of fuel mixed at 20% nitro = 25.6oz nitro in a gallon of mixed fuel
1 gallon of nitro will yield 4 gallons of fuel mixed at 25% nitro. = 32oz nitro in a gallon of mixed fuel
Synthetic Klotz is readily available
(and it smells good.)Castor is readily available in gallon form from many sources.
(I bought mine from McMaster- Carr on a trusted tip from Howard Rush)Methanol is cheap enough per gallon to hardly matter in the grand accounting of costs in this hobby.