this same applies to RC Air. I have not, and do not plan, to do RC ground, but, with my airplanes and helis, I have a couple of turbine jets, which is another story entirely, but aside form those, EVERYTHING i have has been converted to electric. Nitro is a royal pain, and not worth the effort. With the advent of cheap batteries from hobbyking.com, electric has become very competitive price wise with nitro, even when considering multiple battery packs. For instance, a 6 cell 5000mah LiPo, which is 22.2 volts.. will fly an airplane which is approx a .60 size nitro engine. Those batteries run about 60 bucks a piece, a motor for 40, and an ESC for another 30.. 9these are estimates, not hard #s)
A decent nitro engine int hat size would run about 200... so... if you bought 3 batteries, plus the motor and esc, that's about 50 bucks more than the nitro, which would EASLIY be made up in paying 22 bucks a gallon or nitro fuel...
Not to mention, with electric, you plug it in and GO! no more fiddling with crap, you just FLY (or drive)...
Do some research also, there are modules which have been developed for RC air which use a speaker and a digital processor to reproduce engine noise... nothign quite like having an RC P-51 that actually SOUNDS like a real Merlin! bet there are some modules for rc land out there similar...
Been in RC air for 27+ years, and my best advice is GO ELECTRIC (unless you want to go turbine, but thats a whole nother thread)
Matt