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TS Performance Chip Installed, Fuel Economy Went...Down?
Hey everybody. I have owned my 2000 PSD (crew cab, long bed, 4x4, automatic, all stock) for about 4 or 5 months now, and while it has been a pretty good truck so far, the one thing I have been disappointed in is the fuel economy. Now, I knew it wouldn't get 21mpg like my old Cummins did, but the average I have been seeing out of the truck is about 15 mpg while empty, and typically 11 to 12 while towing. I replaced the fuel filter and air filter, changed the oil and filter, etc. So I decided to try a TS Performance 6 position chip, which *everyone* claims is good for anywhere from 2 to 4 mpg.
I installed the chip last week, and after working out some bugs (basically, making sure the terminals on the ECU were clean enough) it seemed to be working- I had stock, fast idle, and 4 HP ranges from 50 to 140+. Per the recommendation from TSP's tech support, I put the selector in 75HP mode (they said that would give the best fuel economy) and we proceeded to drive the truck 300 miles, mostly highway, to visit my parents for Thanksgiving. Typically, in this type of driving, the truck would get about 15mpg. But it got worse. Much worse. We averaged 12.5. Eeek.
On the way back I made sure that I drove the whole way, kept a light foot and set the cruise at 65 on long, straight, level stretches of highway. We still only managed a little over 13 mpg.
What is everyone else's experience with this chip? (and please, no "TS sux!!!!" type of comments...I'm looking for constructive help, not biased opinions) Anyone else getting worse fuel economy? I went with the TS because it was less than the cost of other chip options, and I really don't need or want a fancy readout screen or anything. I simply wanted better fuel economy. And boy...did I not get it. :-(