Well, having owned a 6.1 150 and more recently a 6.1 204 4-motion I actually did some tests and comparisons, as far as I can be consistent with conditions and roads. I was planning to do a video about it but realised I had more interesting things to spend my time on... however, I just dug out my notes...
The comparison was the two vans under the same routes, multiple trips average for each use case. I also did trips driving like an old man vs driving like I was 20 again to see how much the driving style affected things... so here we go...(Betty Boo is the 150, Hunter is the 204 4-motion)
obviously traffic conditions did vary as did weather, hence averages. Take from it what you will, more fun than science.
Averages mpg across multiple runs of each:
6 mile journey A from cold - Betty Boo 37.3 mpg Hunter 33.8mpg
warm engine:
Road 1 - BB - 37.7 Hunter - 35.3
Road 2 - BB - 48 Hunter - 36.4
Hill 1 + constant 28mph - BB - 18.2 Hunter - 17.3
Teenage me vs Old me (extremes of driving techniques)
Road 1 - BB Old - 37.7 BB Teen - 27.1
Road 1 - Hunter Old - 35.3 Hunter Teen - 23.2
Road 2 - BB Old - 48 BB Teen - 34
Road 2 - Hunter Old - 36.4 Hunter Teen - 23
So, from this broadly speaking my 150 is 10-20% more fuel efficient vs my 204 4motion (same wheels and tires by the way - I transferred them)
My driving style is a more significant difference, possibly 30%.
All that said, for my normal driving over several tank fills (albeit sometimes longer runs included)... Betty Boo 34.3mpg Hunter 32mpg - so I'm quite pleased with that.
Short runs can be as low as 18-22 mpg, longer runs can be 40 even in the 4-motion as long as I don't floor it.
Finally, I recently had Koni shocks fitted... while it does make things smoother and removes much of the roll, there is a downside - I have found myself driving significantly faster as a result of the subconscious feeling of more stability round corners etc... hence I have lost mpg as a result of more comfort.
I am glad that I finally did something with that data - drive slower, less time on the pedal and longer runs will give you into the 40 mpgs even with a 4-motion (I have the diff lock too by the way which also adds weight). Drive like a teenager, short journeys and you could easily be 15mpg I would say. Stating the obvious really.
(a shout out to
@Delian - a buddy of mine that just got his first Cali. Please everyone say hello to him, he is very shy
).
Hunter:
View attachment 117355