I'm looking at Octavia estates, and see that there's a huge penalty in *official* fuel consumption for the 4x4 version. For example:
2.0 TDI CR 150PS - 55.4/76.5/67.3 mpg (urban/extra urban/combined)
2.0 TDI CR 150PS 4x4 - 47.9/65.7/57.6 mpg
So for the combined that's nearly 10mpg difference, or nearly a 15% reduction by going for the 4x4.
This seems very large to me, for a system that is meant to be light-weight and operating in 2WD mode most of the time. I get that 100kg is not nothing, and there is still some axle and clutch rotation to present extra friction to the drivetrain. Also that the multi-link suspension might add a futher bit to the weight.
Are there any other reasons for the drop in official figures?
Ultimately, I'm only concerned with real use figures of course, but if I can figure out the reasons for the drop in the official tests I might be better able to judge what the real-world impact for me would be.
Thanks in advance,