Originally Posted by Rogeyboy

Well my EFi Orion had one as standard in it and when i recently changed to OFAC Turbo ECU the computer reads but not accurately, ive worked it out to be 1/2 reading. So it thinks im doing 17mpg when in fact ive got nearer to 34mpg... Could this be a difference in the wiring as Fiesta RSTs did not have a fuel comp..?