Alan, we have run over 6300 US gallons of mogas through our O-540, without a burp. (And the previous owner used mogas, too.) In fact, the ONLY time I've had any engine trouble has been when I was forced to run with avgas, on a long cross-country flight. We ended up in a long ground hold (in Titusville, Florida) for a nearby presidential "aircade" (what's the aviation equivalent of a "motorcade"?), and unwittingly fouled the plugs. On climbout, I lost the number 2 cylinder completely (thank you, EDM-700!), and had to make a semi-emergency landing. That would NEVER have happened if I wasn't forced to burn that 100LL crap. Anyway, see pix of how we built a mogas hauler: http://alexisparkinn.com/fuel_truck.htm Without "The Mighty Grape", hauling mogas in 5-gallon "jerry cans" is an awful, slow, messy, and dangerous job. With it, gassing the plane is much nicer than using the self-serve pumps at the airport! Of course, now we're going through this "ethanol" nonsense, where our government is trying to mandate the use of 10% (at least) alcohol in our gas, as a way of using up all that tax-bought corn that no one really needs. Ethanol isn't usable in our planes (that's another rant, for another post), so -- if you're in one of the states that thinks you're too stupid to choose which gas to buy -- you're out of luck. Luckily -- amazingly -- Iowa (the source of most of that welfare corn) still lets me choose whether I want ethanol or gasoline, so we're still good here. For now. -- Jay Honeck Owner/Innkeeper www.AlexisParkInn.com "Your Aviation Destination" -------------- Original message from Alandwood@xxxxxxx: -------------- Hi, Here in the UK fuel has now risen to £1.40 ($2.59) per litre and is warned to get higher! Does anyone have any more information on running the 0-540 on mogas? Good to hear you are all still around. regards, Alan