Numerous Problems, No Fixes Photos Added

['08 X5 3.0si]

Originally Posted by JBHorner

One of my biggest beefs with dealers are when they say, "we cannot reproduce the problem." I remember one time I was so angry, I replied, "You're right. I made it up. I was bored, had nothing better to do with my time, so I made up a few problems and then brought it in to see if you'd catch me."

I wonder if the fuel mileage is influenced by temperature? I've noted that warmer weather, or colder weather, influences my mileage. I presume it is the AC, in addition to air density having an impact. It's a reach, I know.

I don't buy #1. I've never had this problem. It sounds like the outer seal leaks, and the inner seal holds the water in. Hardly what I'd call a normal condition.

Joel

Heat and the use of A/C do have an impact on fuel economy.

According to research conducted by Chevron, the average percent reduction in fuel economy due to temperature (20 degrees F vs. 77 degrees F) was 5.3% The maximum observed was 13%. Running the A/C in "extreme heat" resulted in an average percent reduction in fuel economy of 21%. That's pretty sigificant.

Aside from A/C and heat, the largest contributing factor to reduced fuel economy was Acceleration Rate. According to the research, the average percent reduction in fuel economy between "hard" and "easy" acceleration was 11.8% with a maximum of 20%.

For someone like me who lives in Phoenix, about the only thing I can [or am willing to adjust] is acceleration rate. I went for a day drive yesterday and minded my throttle from full-stop and achieved 21.0 mpg through a mixture of city and mostly highway driving.