i wont patronise you by going on about roof racks and not carrying things you dont need etc but you will save fuel by driving properly. Get to know what your car can do. If you dont need to slow down as much you dont need to get back up to speed. Accelerating is expensive. So is changing gear so do it less. The 2 litre will accelerate from 30mph in 5th gear. It wont pin you in the seat but its cheaper than changing down to 3rd. This is assuming you are not in a 30 limit though. 5th is no good for urban driving. Motorway driving is cheap but it can be cheaper. Forget cruise control. Going uphill you can ease off and let gravity slow you down (60 is acceptable) then let gravity bring you back up to speed again going downhill. Base on a test i did in a truck with an auto box i saved a lot of fuel by doing this. The cruise control tries to maintain speed by chucking lots of fuel into the engine. Dont use it on hills