between 1934-1939 Mercedes Benz in their Grand prix cars ( M25, M125, M163, M165 ) used - in a fuel provided by shell - acetone (methyl-alcohol 86.6% nitro-benzole 4.4%, ACETONE 8.8%, sulphuric acid .8% )

Acetone was included in the fuel as a coolant for the valves and piston heads..

thought that was kind of interesting.


Scott