I just did a trip with our new 1998 B3500 pleasureway widebody 5.2l and got 15.8 miles per imperial gallon . on the day I checked had the air on and driving about 105 km an hour . I also have a 1990 pleasureway thats not a widebody that we just averaged 15.5 mpg on a 3300 km trip thru B.C. no air needed on that trip but I have got as high as 18 mpg on the prairies, that was overall mileage which included some driving in cities and some sightseeing. It would depend a lot on your rear end gearing.
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