Hi Tom!
I have stated and landed on grass without problems i neded about 80 meters on grass berfore it goes of.
Iwill recomend tarmac because the landinggears in wing is not very strong, i dont have to repair yet but i see my legs have bent backwards a bit.
Ivé use Mc Coy Mc9 plug and straight 80/20 fuel on a os 91 with Bwm pipe.
Ivé had to change plug after 15 flights but the plug where ok . Just saftey
Ivé got to tanks about 325 cc and it will be 7-8 minutes flying on full throttle and it´s fuel to take a another lap to land.
Sorry for my bad english [&:]
Regards Tobias