Advantages of 100LL AV GAS:
- Has a long shelf life (one reason it's used in full scale aircraft)
- Doesn't deteriorate carb seals, diaphragms, etc. (another reason it's used in full scale aircraft)
- Doesn't stink like pump gas
Disadvantages:
- Slight loss of power and performance in RC engines
- Availability
- Cost
Advantages of regular pump gas:
- Available everywhere
- Cost
- Better performance than AV GAS in RC engines
Disadvantages:
- Short shelf life; tends to lose octane after 30 days
- Stinks
- Alcohol tends affect carb seals, etc., particularly in older engines
If alcohol in pump gas is a concern, you can add Startron to neutralize the effects.
