designer

Two issues I need help with. Firstly the mileage display shows ongoing fuel consumption (30.5 mpg which is 50% better in my new Touareg than in the old one) since I had the car, shows consumption on a momentary basis etc.. I want to be able to see the consumption on a specific journey - for example if i decide to drive to Brussels how can I get it to tell me the mpg achieved on that journey? Secondly how can I get it to boot up faster? Because the heated windscreen and heated steering wheel only turn on through the environmental controls on the computer, I have to sit in a damn cold car waiting the two or three minutes for the computer to boot up before I can start to defrost Can anyone help please?