Am I a moron if I do this *Finacial Guys Get in Here*

Its a fullsize SUV that on a good day lately has been getting about 15 miles a gallon (Stupid aggressive cam) its getting a little old, and I am tired of driving around a large truck I want another car. I do $300 (Plus 100% matching from my company) into my 401k every pay period, I have a few other investments that are continually making money, retirement is planned for decently enough, I am also the type where I feel that I should enjoy what I have and not save for the day I die.

Student loan will be paid off in 5 years (significantly less), and having a DD does not mean I am not spending about $80 a week to just drive it.