I have had my 10 plate fiesta for a week now i ran it down when i got it i filled it up 38.05 litres = 8.5 gallon only got 390 miles out of it. So i was only getting 47 mile to the gallon and i drive mostly motorway. So i had a trip into the steelers they said cold weather new engine it should get alot better return after about 10000 to 15000 miles on the clock when it is run in and the weather gets better. will wait and see i know one thing the car doesent like v power so i have allways used tesco diesel and never had a problem so filled up to day and see what i get out of it then. Well i picked the car up with 1900 on the clock would it be wise to get a ecu reset.