MPG affected by changing my battery?

I own a Ford Focus 05 1.6 90bhp, I recently changed the battery and mpg has risen via EMC can I get it back to the lower figure by reconecting battery again, or is it a dealer issue. Also do you know if this model uses glow plugs, as I can't find them?

Asked on 8 November 2011 by oldshaun

Answered by Honest John
If it's a diesel, yes it does have glowplugs.
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