Thanks for the link V.S. Tech. An awful lot to read however it was exactly the type of info I was looking for. I missed this thread somehow. Also Doktor bert thanks. My Drive to work at the moment is 40 miles each way with 25% of that being on rolling back roads at around 50mph but still u and down hills.
The rest is pretty much 55-60 but fairly flat. At a glance I am getting 26 mpg with:
New Tires _ Kumho SR722 ?
Valves adjusted
needs filters replaced
Tools in the trunk
Portable router table and Dovetail jig in back seat
4 old brake rotors off my Suburban

I will get these things removed and see how things go.
I recently started driving her a little easier in respect of her age.
Thanks
Alan

__________________
92 500E Silver 66k
82 Porsche 911SC 84K
68 Cadillac ( Gone Now )
03 Suburban Z71 200K
85 300SD 217k From Original Owner ( Dad )