 C14 min. Don't ask me how I know...  Engine sounds great though, bet it would idle a little lower than that... Not to appear pedantic but I think Europe uses a different way to rate octane numbers. IIRC I think 100 octane Europe is equivalent to 107 (ish) Stateside. Still not enough IMHO though. yep! i think 100 octane is around 106/107 US Gasoline .. idle is around 1300 RPM The Euroepan 98/99 octane is about 93 octane US. European gas is rated as RON octane, while US is (RON + MON)/2. Race gas is available, and it must be unleaded, we are using VP MS109 at the track and regular 95 in the street. Was a bit difficult to obtain MS109 in the states... The last barrell I bought cost 26.7$ a gallon. Dirt cheap! Apologies to the OP for the Hijack, I usually use some 100LL avgas, I always thought this was MON rated only, and I always thought the ratings were the other way round (lower octane in the US). I guess everyday is a schoolday 
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
| 
