They're all going to put more money into developing new gas engines due to the initial cost, complexity, and huge repair costs of the modern diesels. What's one injector worth these days? $1500? I bought a set of 6 new Bosch (RV275) injectors for my 2002 5.9L Cummins for $300 a few years back.
Customers like me have decided diesels aren't the reliable anvil they used to be. They are fragile, delicate, and costly when compared to their predecessors. You won't find a 5.9L Cummins or a 7.3L IH that will limit you to 5 mph because it's out of cow pee, or because the exhaust choking device is clogged. Yes they're powerful, but no thanks.
I'll pay a 2-3 mpg penalty at the pump (for less expensive fuel mind you), for a bit less power and gain reliability, and avoid the OMG repair costs that are inevitable in any engine.
