Vapour lock tends to be a hot summer problem here. Theoretically you can't fly if your tank temp goes over a set limit. Carb ice we all know about and is more of a problem with mogas than avgas but then one aeroplane can be more prone than another so nothing new there.
You can mix the two, so there's no problem with filling up with mogas at your home strip and topping up at your destination with avgas. You must also record when using mogas in your engine book.
Only certain engines are cleared to use mogas ... esp as here in the UK as leaded fuel is pretty unobtainable so unleaded is the only mogas you can get. Most low compression aviation engines are OK but valves need watching ... check first.
Aircraft cleared must be placarded and another condition is a resriction on altitude to no more than 5000 feet. I use mogas in a VW powered VP2 with no problems at all (including carb iceing). It's certainly cheaper and the conditions aren't that restrictive in most pleasure flying situations.
IM
Last edited by shortstripper; 21st October 2003 at 14:47.