About the only negative with a diesel engine is weight. Due to the massive stresses involved with the compression cycle everything is quite beefy, so a gas engine's diesel equivalent will be nearly double the weight. But many get wrapped up in comparing horsepower and you can't really do that with diesel to gas comparisons. The way they operate makes driving them somewhat different, especially older non-ECU diesels. The ECU diesels are almost like gas engines. For example, take a drive in a new VW TDi Golf, Beetle, Jetta or Passat and you'd have a hard time believing it wasn't gas.

As for economy, you can make anything inefficient by having an aggressive driving technique. Diesel fuel, petroleum or bio, has significantly higher energy density compared to gasoline. Pretty much the inverse of ethanol, but to a much greater degree. That's why the VW TDi mentioned earlier will get close to 800 miles per fill-up with good driving habits. But with the right gearing diesels really shine with heavy trucks since you operate mostly in the torque band, getting the most economy from the engine.

So how much longer before you rotate out? Hopefully you'll find a job market receptive to your skillset with a spot doing something you'll enjoy or find challenging. As for Florida, as a native it's very disturbing to see how much environmental destruction is being waged to support housing development for the average 900 people per-day moving here. Winter Haven is pretty much between Tampa and Orlando, so we're getting majorly developed. Our county, Polk, is the largest in Florida and used to be the most sparsely populated. Now it resembles the aftermath of a strip-mine from Hell that some demon crapped cookie-cutter houses all over.

Guess that's progress.