(01-11-2010 07:51 AM)Gary Wrote: Hmmm...may be several things at play here, using a bit of diesel in gas. For one, it's more lubricant. That may lower ring and piston slap friction. Adding cetane rating to gas seems to be possibly a boon, but why didn't the gas companies do it? I dunno.
I remember a nut who used to fill half diesel and half gas now and then to clean out his engine. We didn't have mosquitos for miles when he drove that thing around.
Gary- here is more on the mix-
"Trying to use diesel fuel in a gasoline engine also has unpleasant consequences, but generally not as dire in terms of damage to the fuel system. Depending on the proportion of diesel fuel relative to gas in the tank, a gasoline engine will either run poorly or stop altogether, necessitating another $500 trip to the repair shop for draining and flushing. A couple of old grease monkeys at the shop I used to work at claimed that their "super high-compression" gasoline engines of the late 1960s could easily switch between gasoline and diesel fuel with no problems, but I tend to think they spent too much time inhaling fumes from the carburetor cleaning tank.
Some old-timers and shade-tree mechanics will add small amounts of diesel fuel to the gasoline in their cars in the belief that it will lubricate the valves, in the same way that people will add such items as "Marvel Mystery Oil" and automatic transmission fluid to their gas tank. I can find no reputable studies that show any merit to adding diesel fuel to gasoline. While small amounts of these items aren't likely to kill the engine or cause permanent damage, their use is not recommended. Some of these same old-timers advocate adding small amounts of gasoline to diesel engines to "burn out" carbon deposits and "clean the injectors and valves." This is not recommended by any diesel engine manufacturer I know of, and due to gasoline's resistance to burning from compression ignition, it's possible it might make matters worse by lowering combustion temperatures. In any event, I found no support in any of my combustion and automobile resources for the idea that gasoline and its additives would "clean" diesel injectors or valves better than the additives already in the diesel fuel.
In short, don't put the wrong fuel in your vehicle. If a significant amount of the wrong fuel does wind up in your tank, have the vehicle towed to a repair shop lest you ruin the fuel pump or get stranded by the roadside. If you want to use inexpensive diesel fuel, the solution is simple. Buy a diesel car."