I have both the G62 on a mag and one on ignition (C&H) and I run the Champion RCJ7Y. This plug in a mid heat range plug (between the cold 6 and the hotter 8) and the plug works well for me. I used to live and fly in Denver and I now live and fly in San Antonio Tx and still use the 7 and have never had any plug problems.

RC pilot:
You noted you would like to find a "good" gas. When I lived and flew in Denver (1990's), I would got to Jefco airport and buy 100 low lead avgas. I still buy and fly the 100 LL here in Tx and I have never looked back. The current price here in San Antonio is about $4.35 per gallon. It is a little more than you would pay for premium but I think it is worth it. The av gas has no smell so when I put it in the back of my truck I don't get that gas smell that you get from auto gas. It also has no ethanol. If you stilll want to go with a non aviation gas, Power Master is now selling pre mixed gas for model use. Power Master was recently purchased by Alllied Chemicals (they make the VP auto racing fuel and a lot of the Nitro used in this country) and they have invested quite a lot of time and money for this new line of fuels. I only know this because the distribution center for the fuels is in the San Antonio area and I get to talk to the sales people periodically. They have started advertising in a number of model mags so check their ad for the website.

Just my 2c.

Ed