Better flowing heads will help, as will a low restriction exhaust system. Using a clutch fan can help a bit. Inflate the tires to the max allowed, coast when able, use brakes sparingly, start off slow, etc. There's a member who mentioned a site where the members trade ideas and such for extending their MPG but I don't recall the name. Google will likely show something.
One of the biggest improvements can be found by decreasing the accelerator pump shot to the bare minimum required. This will be found to be too lean until the engine is up to operating temp., but will net you an increase if you do a lot of stop and go, on and off the throttle driving. This may also require you to use a "custom" reduced-travel pump cam and/or a smaller than normally used shooter.
The gasoline where you are is figured differently than it is here in the US. We use MON (motor octane number) plus RON (research octane number) divided by 2 to get a "anti-knock index" number. But we still refer to it as being the "octane" of the fuel.
You guys use the RON number, which alone is higher than our rating by about 5 numbers, i.e. your 95 octane is our 90 octane, give or take.
Last edited by cobalt327; 06-01-2010 at 11:29 AM.