You already have the most fuel efficient of the D5s. The 185 will not match it and the P3 205 with twin turbo will empty the tank as you watch with the big turbo spinning.
I had a 2.4 tdi P1 140 bhp v70, 45 mpg around the houses 53 mpg on a motorway run.
Now have a 2.4 D5 xc70 2wd 175bhp with polestar to 195 single turbo.40/42 mpg around the houses and have seen 58 mpg running light on motorway. Use the extra 50 horses and the smile is as big as the bill.
Unless there is a very pressing reason to change I would keep what you have and know. I changed as I was starting to struggle getting out of the v70 and was spoiled by the ease of egress from the discovery.
Paul.
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