Magnus, I tracked down an MSDS form for the 50:1 TruFuel...
https://www.menards.com/msds/114217_001.pdf
Page 2 says:
Naphtha (petroleum), full-range alkylate, butane-contg. 50 - 60% by weight
isopentane 10 - 20% by weight
pentane 10 - 20% by weight
toluene 5 - 10% by weight
xylene 5 - 10% by...