1. Between 3.5 and 4 oz. Depends on your mounting of the CDI and how much of the plastic spiral cable protection you use.
2. Receiver battery, but I'm on 2.4 gHz. I wouldn't do this on 72 mHz.
3. 30% Cool Power heli fuel.

Real benefits are about 40% better fuel economy and ability to swing a 19x11 APC.