Agree about talking out of turn,, ,but most of those units fool the ecu by telling it the temperature is colder, or mass air flow is reading higher,, to allow more fuel, a bit more advance on the timing curve, and other methods... thus you can get 25 more hp.... BUT... How you drive is the final answer on the mpg's.... or the power... I had a towing truck that was limited in fuel, and thus smoke.... and when hauling hay (over weight) it would really let me down and not go to near the rev line in each gear, but I could shift up and it would allow it to accelerate...The plug in added just enough to make it tolerable and actually safer to get through each gear and get the fuel it needed.. Not a race car, but satisfactory... The mpg's unloaded were at best a couple of mpg, no more,, and quite frankly most of that was probably because I am a hyper-miler and use very every driving trick to keep the mpgs at their peak.. Most of my friends however had the opposite effect as they were whoa and go guys with only 2 speeds... whoa,, or wide open(go!)... And in their case, they went quicker and got less mpg with the plug in chip. While that 2002 diesel dually was rated to pull 13,500 in trailer,,, my 2013 is rated to pull 24,500 in trailer. So now even though twice a year I pull a 30k plus load of trailer and hay, it actual has plenty of power and then some. Thus, no mods needed. Inherent mpgs will have a WHOLE lot to due with the rearend gears and thus not much will change the mpgs over that. Where the 2002 had a 3.55 gear and could get 19 to 22 mpg empty, the 2013 has a 4.57 iirc so now with 48k on the clock I am finally seeing it bump to 14.7mpg on a really good day and really happy to get it. Glad to say, it only moves with a trailer on it as I have a diesel passat for my run around and its lifetime ave mpg is just now at 47.5 at 80k on the clock
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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