The hardest part of installing the Dynamat is taking off the door panels. I put it in all doors, the tailgate, over the rear wheel wells, and under the rear carpet. Give yourself about 6 hours to do the job well and you'll need about 60 sq. ft of Dynamat. As far as mileage I made a dramtic discovery on this trip. In the middle of the Yukon on clear, non rainy days, it's common to see a car go by you at 95 mph plus, but be careful because these roads have rocking slabs and gaps between slabs,and you can go airborne at high speeds. We had one leg where I kept the H3 at a steady 82 mph and the gas mileage fell dramatically to 15.0 for those 220 miles, I even got it up to the limiter one time going downhill. I feel that realistic mileage on all cars is at least 25% below posted. My son has a 2003 Toyota Prius Hybrid that gets 29 mpg in real world driving. We went one day, north of Kluane and saw a total of 11 cars all day long, so in many areas you can put the hammer down for long distances. I consider our biggest feet coming back with the windshield unscathed!
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