Is this fuel economy normal

I bought a 2006 Mondeo TDCI. It's running perfectly and has just had a major service. I'm only achieving just over 120 miles per 1/4 tank and thats on motorway doing 70-80 mph in 6th gear. Trip computer only gives 533 mile left on a full tank of diesel when I filled up. Is there something wrong or is this mpg right? Any advice will be much appreciated.

Asked on 7 September 2012 by richard pope

Answered by Honest John
Work out what the mpg is, then compare it to what everyone else is getting at www.honestjohn.co.uk/realmpg/ If substantially less, then you probably have dirty injectors and/or a clogged air filter. Replace the air filter, put some fuel system cleaner in the tank and fill up with Shell V-Power diesel. Hopefully, that will sort it out. If it doesn't, then the car may require some work.
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