Well, if you look over in the "Gas Engines" forum, there is a huge "ballyhoo" about this, with proponents on both sides.

Having said that, I decided to try it. My latest plane, an ARF bash with a BME/Supertigre .90 on gas/ignition, is controlled by a Hitec Aurora 2.4 rig. I am running the ignition system and the radio both on one battery. No problems so far. (I am not using an isolator of any kind; just running both the receiver and ignition off one battery to save weight.)

Apprently from what I have read, the RCEXL ignition likes 4.8 volts but will live on 6 volts. No more than that however...

AV8TOR