A few niggly bits

[PoliceDog]

Hi All,

I'm rather new, so I'm not sure if this is where this kind of topic goes, but here we are.

Right, I've got a few queries about my 2008 XF 2.7D. One relates to DPF and MPG. My DPF warning came on the other day, so I know about the "give her a good old blast" cure, it's only in orange and not restricting power at all, so a good run and a bottle of Wynns DPF cleaner it shall be, but since this happened the Jag is reporting some fairly unrealistic MPG figures, for example 52.2 on a short run of about 9 miles, which consisted of somewhere around 6 miles of cruise control 50mph (average speed cam area) and the rest in normal 30mph town driving. It's reporting 35-45 on just town driving, which I don't honestly believe as I didn't get much above 40-42 in motorway circumstances beforehand. Any clues? 

Secondly, the transmission smells hot after 4 or 5 miles and ticks furiously, like metal cooling down and contracting back into shape once the car is shut down and parked up. Am I liable for the tranny to blow up on me at some point in the near future?

Lastly, I heard of butterfly valves getting sucked into the engine and blowing things up on the 3.0D, does this happen in the 2.7 as well? Should I be concerned with a car with 96,000 on the clock?

That's about it for now, sorry for the war and peace style post.

Ben.