Thought I would share the detail to the recent Terraclean of my car as I hadn't seen others who have had it done on a 2.2 XF.  I have a 61 plate 2.2 XF. I thought others may appreciate the detail on what is a reasonably expensive process (£126). The note below is unapologetically a little nerdy!

 

I bought the car a couple of months ago and it had done 67,000 miles. I have always used Shell regular diesel and got 45mpg over 3000 miles from mixed driving, with a fair amount of motorway. This is my first XF and the first auto for a while so had nothing to compare to. I ran Redex cleaner through when I bought it but didn't see any difference. 

 

I took the car in for a Terraclean on Monday and immediately noticed it was much smoother with what felt like slightly earlier and smoother gear changes. I have driven about 600 miles this week for work, a fair amount on motorways, with a lot of stop start in traffic and navigating in an out of a few major cities on the way.

 

The overall MPG is now 50.2 and at one point saw nearly 60mpg. Yesterday I was 'making ground' on the M40 and MPG dipped to 48. Using the 'auto' mpg setting my sense is that there is a small (5-10%) increase in MPG in mixed mode driving vs constant speed driving where there a consistently +10% increase. In the latter case I use the cruise control and use the paddles in D to keep in 8th when I want to overtake on the motorway. 

 

To complete the detail my car is running on 18 inch Vela wheels and Pirelli P zeros inflated to 2.1 bar (as per handbook).

 

Overall I had the car Terraclenaed with the hope of a small increase in fuel economy. The results have exceeded my expectations from an MPG perspective with around an extra 60+ miles a tank . In addition the smoothness has improved.

Hi Ian,

 

I had my car terra cleaned 18 months ago, and I also noticed an immediate improvement in mpg and performance.  The best mpg I have had is 51.3 mpg on a 90 mile journey to Sheffield and for the round trip 48.6 mpg.

 

The 2.7 litre diesel is currently returning just over 30 mpg on city driving and about 42 mpg on mixed driving.

 

Peter.