I changed my 06 2.7 6 speed TDV6 for a 2012 3.0 SDV6 with the 8 speed autobox a few months back and was told the newer car was more fuel efficient but I am finding it far thirstier than my old car.

My 06 car would easily do 490 - 520 miles on a tank of fuel, my new car only does 440 - 460 on a tank.

what are you getting from yours? Michael
2013 RRS diesel Autobiography Dynamic

Mine is mid 20 s around town (lots of hills ). Mid 30s on a steady long run . I would think upto 540 on a tank . You may need to get yours looked at .

Are the fuel tanks the same size? 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
2018 Melting Silver Mini Countryman PHEV - soon to be replaced
2015MY Corris Grey SDv6 HSE Dynamic, the best car I have ever owned, totally reliable only a cou0le of rattles in 3 years, now no longer in my care
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW

I went from MY10 3.0 with 6 speed to MY13 with 8 speed and seen mpg up from 27 average to 30 according to trip computer. Best I've seen is 35 on long runs  Wanted a Series 2 LR since childhood but previously owned MY16 Disco Sport HSE TD4 Auto, MY13 RR Sport Black Edition TDV6 Auto, MY10 RR Sport HSE TDV6 Auto, 2007 Freelander 1 Freestyle TD4 Soft Top, 2009 Freelander 2 GS TD4 Auto, 2007 Freelander 2 GS TD4, 2004 Disco 2 Metropolis Auto, 2002 Disco 2 GS, 2000 Freelander 1 SE TD4 SW

Still hoping for a S2 one day!

Mine is used mainly on long motorway trips and normally 35mpg.
I tend to drive like Miss daisy so I am told. MY13.5 Autobiography, Santorini Black, Privacy Glass. Gone
Driving a milk float for now.