OP has a very good point but trying to include weight as well as fuel used for econo calculations would quickly get onerous. Most people are barely capable of calculating mpgs, much less knowing how much thier rig weighs. And the potential for errors in the calculated results gets pretty bad too without good weight info... perhaps there needs to be a scale next to every pump?
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Tempo/Topaz:
Old EPA 23/33/27
New EPA 21/30/24
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