![]() ![]() Then about a year later the country and CA went with Ethenol gas and the milage dropped back down about 10%. In '06 I installed Brazel's UltraPower and Cold Air filter modification. Since day one I track my fuel, milage and generator hours to calculate mpg's in an Excel fspreadsheet. With the Suziki and full tanks I weigh in at a little over 26K. ![]() Back east I was getting about 0.5 mpg more. That is out here in the West where the land isn't very flat. I usualy get 7.2 mpg pulling a Suziki Grand Vitara 3500 lbs and get 6.5 pulling my 4500 enclosed trailer & sandrail. I have 65K miles on my '04 Chieftain, 39 ft on and extended wheelbase W22 chassis. Kevin, in my opinion you have to make some changes. Is this normal for a rig of this size? Is there anything I can do to get some better mpg? I am not expecting a lot, but I think that 5.5 is a bit low. About the only thing it has ever done is have a low idle at times but that seems to have cleared up recently. It has plenty of power, never gets hot or misses. There is no check engine light and the engine seems to run great. No foul smell like a clogged catalytic converter. The exhaust seems to be okay and not clogged or anything like that. The best I have ever gotten was 6.9 from Amarillo to Okmulgee, OK. I drove most of the trip at 65 mph but did try to slow down for a few tanks but it didn't seem to help. ![]() ![]() We continued our travels east to Nashville, Tn. I wasn't totally surprised by this due to the wind. We drove east to OKC trying to drive anywhere from 55 to 70 mph to find that "sweet spot" where the coach wouldn't have to downshift to fight the wind and slight hills. When we left Amarillo, we had to fight a terrible head and cross wind (about 50 mph). We pulled our Jeep Commander on a 2,200-mile trip a few weeks ago. It is 37' 9" and weighs about 19,500 lbs. It is a 2003 Newmar Scottsdale on a Workhorse chassis. I finally got to take my rig out on a pretty long trip and was surprised by the mpg that I got. ![]()
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