Just been out for a run in the new motor (v6 CDTi) and tried out the cruise control on the bypass.
i noticed that the MPG with cruise control driving was hovering 23-25 @ 70mph. Then with CC off and me driving it crept back up to 30-32 @ 70mph... this would've kept going up but turned CC back on and it started dropping again.
Is this a normal thing (maybe because the car is working harder to maintain that constant speed) ?
i won't be using cruise control too often if that is the case, especially when using Shell V-Power Diesel at 124.9p