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Have you taken these cars out and tried them with your driving route??
Just that the 118d is set up for sitting at 60mph, and if you like to sit at 80mph the 320d will trounce it economy wise.
Same with a 335d vs a manual 330d, more than the power or fact one is an auto it is the gearing, the 330d has a 2.35 final drive ratio where as the 335d has 2.81.
Sit at 80mph in the 330d and you are doing 50mpg, sit at the same speed in the 335d and it is revving 25% higher and only doing 40mpg.
Do you need the AWD of the X1? the RWD version is more fun, and I actually prefer the overall package to the 3 series, the 20d sDrive will return you over 45mpg, but most are only getting around 38ish from the AWD.
I get 44mpg from a 18d sDrive, but can easily see 49mpg doing the same runs in a 20d sDrive auto, better gearing for my type of driving.
Definitely take them out though, as you may be shocked at the results.
On a long run I get about the same from my Brabus tuned E320cdi estate auto as I do my X1 18d sDrive, around 40mpg vs 44mpg, however the average is 34mpg vs 44mpg.
Round town the X1 may drop to 38ish where as the E320cdi can be 25.
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