Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

FYI, though some swear by Coleman, I found a series of pretty scientific shade tree tests of gas alternatives. This guy carbon cleaned engines before and after runs, used infrared thermometers, tach readings under load, even a see through head on a four stroke to compare them.  He ran lawnmowers, generators, go carts, and cars.

By far the cleanest, most complete combusting, least problematic in every way was Zippo.  It’s pricey but beat Coleman hands down for clean burn and power without knocking.