As far as fuel economy it's a wash IMO. Diesel fuel cost more but have seen it cheaper now. Engine Life? A gas burner will last for 300k now with proper care. Service is more expensive on a diesel IMO. I have had both and really makes no difference to me as long as you have the proper package. I do hate the smell of diesel and noise. newer models have really improved on the diesel noise. Just go with what you are ok with.