Posted by NCWayne on April 25, 2008 at 15:07:15 from (166.82.206.74):
I keep reading posts talking about gas mileage being so much better at X MPH vs Y MPH and how they were running at X MPH when someone passed the 'wasting gas' going Y MPH. Well, that might very well be true if we all drove the same vehicles with the same engine and gearing, all with the same tires and amount of tread wear, etc etc etc. There are so many variables to factor in so in reality all you can do is speak for your own vehicle. My reasoning behind this statement you ask. Well 55 seems to be a well liked number for saving gas so I'll use it and my work truck for an example. If you are cruising down the interstate at 55 MPH and I come up behind you in my service truck (FL-106 Freightliner weighing 33,000+ full time) and I attempted to maintain 55 MPH behind you instead of passing, well it's gonna cost me. Why, because my truck has an Allison Automatic with double overdrive (ie 5th and 6th gear are both overdrive). At 55MPH, in 5th gear, the engine is turning in the neighborhood of 2000 RPM which is out of it's optimal power band. Now let me hit 60 and get into 6th gear and the RPM's drop back down to around 1600-1800, depending on the grade, which is right where she likes to be. Let me run around town on the interstates where you can barely reach cruising speed (ie 55)and I'm gonna get maybe 4 to 5 MPG but I can hit the intertstate running 60 to 70 and get 6 to 7. Those figures do include running a fuel additive which I found did in fact increase my mileage. Sad thing is before the ULSD came along I was getting nearly 9 MPG when I had to make a long run from home to fix a machine. Less power in the fuel, more fuel to get there, and more $$$$ for the fuel. Just doesn't add up to me, especially at $4.25 a gallon.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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