Hang on - a remap actually reduces fuel consumption?

?
How does that work?!
lol
I could just tell the wife Im making changes to get better fuel consumption............hmmmm.................lol
I use the car to get to work and back during the week, which is mostly motorway/dual carriageway, and the traffic is steady moving, so would probably stick to 'D' mode and drive sensibly to give me the best MPG I can get - that gives me more fuel in the tank for the weekend thrashing

Also, could someone give me a quick list of all the top up fluids I should have in my garage?