Before I start going into a blind panic about my car being broken, would you guys say a drop from 34mpg on average all year down to 30mpg since this cold spell is normal? I haven't for the last couple of days been able to average more than 29mpg but then I've only been driving in less than 5 degree temps (early morning, late at night)
Sounds normal to me. I've noticed a significant drop in economy with the cold weather, especially when only commuting 4 miles each way in the morning and at night.
I presume you have a 1.6 petrol?