Yeah she us thirsty alright, these 6.6l gassers punish you hard for having a heavy foot, even with the 10spd behind em. I had the choice of diesel or gas, but my last diesel was a shop queen, and with the price of diesel, there not much savings anymore. I like to keep the inside of the truck consistent, I only put it at low to cool the inside down quickly. Apart from that, the direct cold blowing on me bothers me too much.