matthew k
Senior Member
- Joined
- Feb 4, 2015
- Messages
- 691
- Reaction score
- 273
- Location
- Winchester Hampshire
- Your Mercedes
- 2005 320 cdi Sport 7 seat estate
Hi, my car seems to be using more fuel. With the cruise set at 72 (70 actual) mph it averages 39-40 mpg, that's after 50 miles +. I'm sure it used to do 44-45 in the same conditions. AC on or off seems to make little difference. The performance also is maybe slightly down too. About a month ago I added 250ml of Redex diesel to a full tank, could that have damaged anything? Thanks