23-10-2013, 04:23 PM
(23-10-2013, 12:06 PM)Jonny81191 Wrote: The thing I've found is if you try too hard, the mpg can drop. Diesel engines like to be worked a bit. Also it's so much more efficient up to temp, so driving like your gran may have a detrimental effect.
Totally agree with this!!
In the Vectra handbook it even specifically says not leave it idling cold but to start up and move off as soon as possible (not sure this means WOT though...
). And it does make a huge difference. I know they're not deadly accurate but watching the 'current' mpg reading on the dash, it rises dramatically when the temp gets above ~80c so I do drive a bit harder to get it there sooner....if I set cruise control at 40mph it takes forever to warm up and uses a lot more fuel as that B road is basically the only kind of journey I do.I also found the HDi liked to be worked hard tbh, I tried to get decent mpg from them by driving how I drove the Golf for mpg (major fail as the Golf was VNT so efficiency was lower down the revs!) and soon realised the mpg wasn't that great....so I drove 'normally' (read: hard) and the mpg rose....only car I've ever had that liked being ragged lol.
