For small glow RC engines with ball bearings, I like fuel with 18% oil, and like best fuels with about 20% of the oil being caster oil. Hopefully you can find the fuel locally, since Hazmat charges will really add up. Because I live in the middle of nowhere, I mix my own fuel. I buy the methanol locally, and buy a 4 gallon case of Klotz oil at a time. No Hazmat charges for shipping oil. Nitro is the difficult thing to find, but racing fuel shops will usually carry it. 5 to 15 percent nitro is about all it takes for most engines, each 5% only adds about 100 rpm on the top end. Finding the right prop size makes more difference to the overall performance.

A typical .60 will go through about 1 oz/min at the higher throttle settings. With the trainer you will often fly at much lower settings, so you easily get 15 minutes on a 12 oz tank.

Batteries - cycle them and see what kind of condition they are in. While you can buy all kinds of equipment to do this, you can test them with a simple resistor and voltmeter. Most of the basic radios used 600 mAh cells, so shoot for a 300 mA load and load the airborne pack checking with a voltmeter every 5 minutes. If it remains above 4.4 Volts for two hours you have a good pack. Less than 90 minutes, not so good.