I said I would do a report after my trip from Newcastle to Plymouth and back.
Shell V-Power and Stage 1 APR map used throughout.
Revo Ceramic and Vanilla Magic tree also both in place throughout
Here is the TLDR:
Newcastle to Plymouth (+62 miles while i was down there)
= 29.39 mpg
Plymouth to Newcastle
= 29.21 mpg
Here is the extra info version:
Newcastle to Plymouth
Before I left, I brimmed at the local Shell @ Redheugh Bridge.
Took a break halfway down @ Hopwood, had used about half a tank but filled up again to see me through.
Once in Plymouth, driving around to see friends/family, and funny enough most people wanted a demo of the car, so add an extra 62 miles of which a great deal of them were very 'spirited' miles indeed. This definitely detracted from the overall economy of this leg, I am 100% sure without the additional miles I was punching well over 30mpg from the m'way driving.
Time to leave, no Shell garage apart from one 15 miles up the A38 from Plymouth @ South Brent, so it was here I took my final readings for this leg of the trip, and reset it all for the return leg.
Plymouth to Newcastle
So after brimming up at South Brent, I stopped halfway @ Hopwood again, had used about half a tank and filled her up to get all the way home.
To be brutally honest after filling up, I couldnt be bothered to drive economically, I just wanted to get home. Read into that what you will. The roads were quiet, so apart from 50mph works on the M1 and some variable speed limit areas, I was pushing my luck most of the way, putting some manners on a few Audi's and Range Rovers, taking just under 6hrs door to door.
Filled up @ Redheugh once I was back in town and took my final readings.
By the way, the onboard fuel computer was pretty faithful to my calculated figures. I reset all once I was moving so it wasnt using historical info for MTE and consumption etc.
Anyway, here is the itemised breakdown so you can see how I worked my figures and you can all say 'ouch' at how much a trip to see my family costs!!
Verdict
Mid 30mpg would have been totally possible if I had behaved myself - but I didn't, especially on the way back.