[8memphis8]

I bought my 2012 x5 e70 last year in May, just renewed my tag, and start doing dpf delete on my own with kit on eBay. I can tell you that the 6 speed is the problem for e70 diesel. at 65-68 mph, the rpm is at almost 2,000 rpm. It is good if you are pulling horse trailer at all time at that rpm and low speed, but if there is a way to swap the f15 8 speed into my 2012, I would.
My average mix 50%-50% mpg is about 22 mpg, 90% highway is 25-26.5 mpg (65-68mph, 70mph or higher it will kill the mpg). By the way, you can't rely on the computer your mpg. I use trip log to log my miles and diesel added. The computer always off by 1-3mpg depending on which terrain you drive.
I have not driven the F15 new body style, with the mpg quoted higher than e70, especially 8 speed, I am assuming it stays around 1,500 rpm at 75mph (Help me out to clarify this for anyone driven f15 please?). Also if anyone think the 8 speed swap is feasible to be install on e70. I agree the RFT is harsh, I am looking into non RFT tires when I replace my tires. The draw back, I am doing Black Car Service, so RFT is a good thing to have in mind if I ran over bad debris that will blow the tire. I guess I can add the spare at the compartment, Boy it is expensive. BTW, I bought it at 50k miles, now already has 100k miles.
Last, please pardon my typo, grammar, and spelling. Cheers.