Brad Penn 30 wt We use a AED 1050 and I have a lean out valve but don't need it, my carb uses a little under a gal a lap,Oil is always clean.To be honest I sent my 1050 to aed for the alky conversion and I don't act any different than it did on gas it starts the same,warms up the same,uses about the same amount of fuel and is just as clean as gas was.The differences were about a tenth quicker and it hits a brick wall 190 degrees of temp.