I supposed you dont realize that him driving the diesel (if he has the tuner set on econ tune) is prolly better for the environment than the half ton gas truck... Do you realize that most of Europe runs on diesel... we "MERICANS" as you put it are way behind our time and need to get up to speed on diesel vehicles that get better mileage and less pollution. Also for your info, since obviously you are clueless, no one currently makes a half ton diesel which, due to its lighter weight, may get better fuel mileage. Although I did hear someone was working on one.
Oh btw I just sold my e99 F250 Powerstroke and am in the market for a newer truck.. Prolly a DMAX or Cummins... So if you have one for sale hit me up.