when was running RC cars years ago. i thought i wanted to mix my own nitro. so i bought a hydrometer. they are not cheap. and i bought the nitro, methanol, castor oil. mixed like i read by SG. then i saw a kid on YOU TUBE doing the same thing only by volume thinking he was right. he wasnt nice when i told him i thought he was doing it wrong. that was 5 years ago. was i doing it right? i liking asking that Q like that HERE cause i know ill get the right answer.