alright! just got a mk3 4 days ago and its been sweet as a nut, put 20 quid in it and it went lovely and as you would expect about 24mph urban, then earlier today i stuck 15 quid in and the needle went from about quarter tank, to just under half a tank, now I wasnt watching the needle whilst driving, but when I got to my next destination (about 8 miles away) it was back down under quarter tank?! how has it used 15 quids worth of fuel in less than ten miles?!
The only thing I can think to mention is that i have a whole in the mid section of the exhaust, which when in fifth on motorway makes a bit of noise, but otherwise its only just noticeable... im stumped...