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post #19 of (permalink) Old 14th January 2006
Sans Prix
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Originally Posted by xcuzme
On a twelve mile run to and from work (motorway) I achieve approx 34mpg but if I do 30miles say weekend out and about shopping (motorway again)I can return 53 !

Best yet 56 (that is between 70&80 in 6th gear ).
Rather inconsistent innit ?

Just had all four glowplugs replaced by renault as I reported bad return on fuel economy and one showed up on diagnostic as fault .
Waiting to see if its made much difference will report later on results
Why should the glow plugs have anything to do with economy? This is not a very professional response to your problem.

It may well be that there was a faulty glow plug but yours is a compression ignition engine and the glow plugs are not spark plugs in a petrol engine. I would not expect to see a difference in mpg on that. More probable would have been a reprogramming of the injection system. Was this mentioned?
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