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There are few things wich are always in my mind during drive my car
1- Air in the tyre should be according to specifications.
Specs are different for different weather and different areas. I know its strange for you to learn_ but this is how it work. so Blind Faith in Specs are now doubtful.
2-I always change the gear after 3000 RPMs
isnt it bit rash _ i am driving 1.3 Liter Nissan Micra and I sometime crack the moment in 2nd gear. so depends
3- Always avoid to change the gear again and again on long drives.
it depends on route. i agree but i wonder if one ever bother to keep on playing with gear stick rather than to sit back n relax.
4- Always fill the tank from only one petrol station.
now that sounds more like being a nerd . Comon man ... keep on switching else u wont knwo which pump is selling the correct proportions of fuel.
5- Avoid to over load the car.
universal truth 
at the end I would say dont over stress ur car... keep ur tyre pressure up to the optimum level. keep on changing gear / engine oils. keep on examining ur radiator so that water may be circulating correctly. keep on checking if you tires tend to jam due to poor lubrication or poor or broken brake drums.... and many more ...
hopefully that helps
