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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Surprising increase in truck MPG
RCM only
On Fri, 18 Apr 2008 10:21:25 -0500, with neither quill nor qualm, Ignoramus15242 quickly quoth: I have a Chevy Silverado pickup that is by now about 18 months old. I was never able to get more that about 220 miles out of a 22 gallon tank of gas, sometimes even less. However, the last three refills, gave me 280, 266, and 283 miles per refill. (I usually run until my tanks gets fully empty, since I have an emergency gas canister for the instance when I run out of gas). This represents approximately 22% increase in MPG that I have hard times explaining. I see three possible explanations. 1) Just before those refills, I did an oil change and used Mobil 1 synthetic oil. The previous oil changes were at a service station. 2) The engine had a chance to "burn in" and naturally improved its efficiency I am told (by friends who buy new vehicles often) that there is no longer any break-in period necessary. One says that precision CNC machining precludes that nowadays. Toyota asks that we vary our speed during the first 1,000 miles, but that's it. 3) something is seriously mistaken in my measurements. Are you using the same pump at the same station all the time? By law, all filling station slabs have to be level, but "settling of contents may occur during shipment." Are you filling the tank or is a gas jockey doing it? Some allow the tank to top itself, others pump in as much as they can possibly get. The extra pumping might be your difference in at least one of those calculations. I need to put the fourth tankful in my new Tundra today and am thinking about having that first oil change with a synthetic oil to see if it makes any difference for me. I am at a loss and am very puzzled. Can synthetic oil really account for that much of an increase? I highly doubt it. The wrong oil in really cold weather can make a difference, but this is springtime. I doubt it, too. -- The only difference between a rut and a grave...is in their dimensions. -- Ellen Glasglow |
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