Just took my first long trip in my the ETH with 275s and the EZ box. WOW I thought I had a great truck before!! With a heavier load and on the same terrain=mountian passes, the mpg has gone up between 1 and 1. 5 mpg. I pull the big passes about 10 to 15 miles per hour faster and the egt is between 100 and 250 degrees cooler!! I have a large camper on the truck and a 9,000# cargo trailer behind and it towes like a little Kenworth!! THANKS PIERS
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