I made it down and back and still had about 1/4 tank left. I have the 2.7 and the Ford Performance tune with 37" tires. On the highway at about 65 I get close to 20 mpg. Going down to Needles and doing the Hart trail, since it was slower and tougher I ended up at 16.5 for the entire trip. That still gives you almost 300 miles until empty. If I am going a long way, I do take it easy on the throttle to conserve. I have never needed to use the spare tank, but I am happy to have it. I think Ford has done an amazing job with the engine and transmission, my 6.1 Hemi Jeep, while a little faster and better sound, never got above 13 on the highway and about 8 on the trail. It was a 4 door, with a 24 gallon tank, but the range was no better.
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