Just to hazard a guess, $4500 for the diesel engine option is pricey, especially given that diesel fuel costs the same or a little more than gasoline. A coworker bought a 2015 GC after I bought my 14 GC diesel, and she expressly didn't want a diesel, even though she had to end up ordering hers to get the color she wanted and the dealership here in town had a diesel in her color. You'd have to keep the vehicle a long time for the fuel economy that the diesel provides to pay off the cost of the engine option. I knew what I was getting into having had VW diesels in the past, and I intend to keep this vehicle until it falls apart, so that was an ok tradeoff for me.