My last tank ran up to 327 miles before the light came on. I figured it out to be 22.86 MPG. That's pretty great for an SRT-6. There were a couple of 100+ MPH blasts in there and a little bit of gridlock as well. I will admit that was 75% highway in the 55-75 Range with Cruise Control when possible. I think I could get 360 100% Highway, but I've never had it on a trip long enough to empty a tank on the highway. I usually average about 300 miles per tank which is about 21 MPG.