Duanne, does your tag actually lift? The tag axle Newells that I am familiar with dump the air pressure to the tag but do not actually lift the tag off the ground. With the tag dumped, you do get a smaller turning radius and don't scrub the tires much since only the weight of the wheel, tire and brake are apply any downward force. Those coaches with lifting tags actually have springs that hold the tag off the ground when you dump the air.
Weight is the largest contributor to fuel consumption. Of course engine size is also a factor. My coach with my PT Cruiser attached (total weight of about 48,500 lbs) gets about 6.4 mpg without the generator and about 6.0 with the generator on when traveling. Many 8V92's get about 5 to 5-1/2 mpg pulling around 48,000 lbs.
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