The grand cherokee option hasn't been selling well since this year you can only get them in the fully loaded option.
Diesel is coming back into vogue.
Honda will be coming out with an accord diesel, and possibly an odessey diesel. Subuaru is talking about it.
And it is very easy to put blame on the regulation.
Go to europe, south american, mid east basically anywhere but here. And look around. You can order Audis, BMWs etc with multiple flavors of diesel in the UK.
Not here.
Diesel Rovers, wranglers etc all off the show room floor.