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What could Make my Punto drop fuel consumption?

hi there,
i have a mk2 53 plate fiat punto and as a general rule i used to get about 450 miles to £40 - £45 with prices fluctuating so much. over the last couple of weeks ive noticed im only getting about 250 miles which is a massive drop and is starting to cost me alot of money.
theres no major performance problems or noises or warning lights going on. and nothing majorly wrong as far as i know as was serviced about a month and a half ago and MOT'd 5 months ago. can anybody please give me a rough idea of what it could be all help is greatly appreciated
sjudge, April 2010
Checked all of these things doesn't seem to be a problem i know somebody isnt stealing it as you can notice it when driving

sjudge, April 2010
Tyre pressure
Dirty air filter
Someone is stealing your fuel

bob, April 2010
link Click here to see other fixes for Fiat Punto.