And you apparently think that I think people are out to dupe ya. Nope. Gas gauges tend to lie sometimes. This can lend to a disparity of 25% easily between the gauge itself, appropriateness of the sending unit signal in referrence to actual fuel level, downhill or uphill, left or right hand turns as will be different depending where the sending unit and float is inside the tank. Happens all the time. This can lead one down a path of inappropriate conclusions. There's no reason not to be exact as possible. I provided the method to overcome this possibility. And why would one want this possibility in the equation if easily overcome to excricate an answer appropriate to the original question posed by the OP? Maybe the "joy" of posing insufficient information to determine the emmotional and decision making makeup of a person(s) making an answer (typical in vocal conversation with strangers, not newsgroups). That is, illiciting an inappropriate answer or emmotional response. Even a perfect stranger as is typical in a newsgroup. Again, we don't need that in this newsgroup. Thanks. Just the facts, ma'am.