well i really didnt explain the diff between a gas engine so here it is.

gas engines have much better acceleration because of the fast burn speed of the gas vapors, but poorer economy during low rpm low load situations since it needs to maintain a fairly constant ratio of fuel to keep the engine within emmisions standards

if there is too much fuel it produces carbon monoxide, and too little fuel and it produces nitrogen oxides.

most gas you buy at a pump doesnt contain much lubrication, but you can add it to your gas fairly cheeply, increasing the lifespan of the fuel pump and injectors.

in a "high performance" situation like racing, gas engines consume much less fuel than a diesel engine and produce much more horse power (although usually less torque) than diesel, which is why you normally see diesel in vehicles that travel for longer distances with fairly constant velocities.