Re tyre pressures, in countries with decent roads, you can run your tyres at optimal pressures. I run mine in SL a PSI or two below the recommendation on the door frame, as it makes for a smoother ride, what with all the potholes and bumps in our roads. Running you tyres hard is better for the engine and for tyre wear, but more uncomfortable on bumpy roads.

Re fuel saving, one thing I do is to minimise A/C usage (as mentioned in Tony’s article). I’ve run a full tank without using A/C at all and got about 15km/L in Colombo. With A/C on all the time, it’s about 9 or 10. I suggest turning the A/C thermostat on the dash to the minimum temp, to minimise the A/C usage, and also to run with shutters down in the evenings and nights, when it’s a bit cooler.

Also, as Tony’s guide says, try to stay at constant speeds and in high gears. Less revs means less fuel.

All other fuel additives are almost always either minimally effective or just downright scams. They may improve your performance slightly but fuel consumption isn’t determined by what’s in the tank. It’s determined by how hard you press down on the accelerator and how your carburetor / fuel management computer is set up. You can find more information at the fuelsaving.info page on fuel additives.