This is no Bull...
I was having a tuff time keeping the jeep at highway speeds so with the automatic(Ill never get a jeep with an auto again) it was constantly shifting in and out of overdrive. I would have to put my foot into it whole lot more to get it to go anywhere. Took it to the dealer and they told me that the pump wasnt providing the proper pressure and it had to be replaced. Their explanation for the bad fuel mileage was because the computer saw the lean fuel mixture caused by the low fuel pressure it would dump more fuel into the mix. hence the bad fuel mileage. Wierd part was that I never got a check engine light. After they replaced the pump, my jeep has no trouble holding freeway speeds. I just recently put the banks exhaust kit and a intake on it and it sounds a lot beter and I did notice a little more hp on the freeway I can now pass other cars. Fuel mileage didnt change too much after the mods.