QUOTE(LaiN87 @ Apr 28 2008, 04:41 PM)
Won't it be heavier for the car for it to be between full and half full? Thus increasing car load? Thus increase FC? It might be saving a few cents by "minimizing evaporation" but then you will waste more money in FC.
P.S. TS never add 1 more (Which is obviously from a fwded e-mail
) :
Use only RON92 petrolRON 92 petrol may be slightly cheaper at the pump, but you might find your consumption higher simply because modern cars have knock sensors that modifies ignition before a knock happens. RON 92 has a higher propensity to cause knocking (being of a lower RON grade) so every time a knock is imminent your ignition timing is automatically adjusted, causing a loss of torque. Bear in mind that air quality, condition of an engine and other variables affect an engine's knock point, so don't be surprised that if your car's manual states RON91 minimum, at certain times of the day (air temperature) it might knock with RON92.
As you know, when you experience a loss of power when you need it like for climbing, what do you do? Tekan more, right?
I've used RON92 quite a bit last time since my car specifies a minimum RON91 rating. However, I found my consumption figures to be worse off compared to using RON97, even after taking into account the minuscule difference in price.
The fuel pump inside the tank relies on fuel to cool it down. Naturally, this will increase the temperature of the fuel in the tank. Notice how, especially after a long distance drive, when you open the fuel cap a forceful hissing sound comes out? That's evaporated fuel leaving your tank for good. The less fuel you have in your tank, the higher its temperature will be, thanks to the hot fuel pump.
All this evaporated fuel can be used by the engine via an evaporation tank that feeds the evap back to the engine's intake system. It's all well and good, but when you have a lot of evap in the fuel tank and the evap tank is already saturated, the rest of it will still be sitting inside your tank. When you pump fuel into a tank full of evap, this excess evap wastefully escapes at the nozzle while the tank gets new liquid fuel. Have you noticed it leaving your tank when pumping fuel? You can actually see it if you look at an angle, like hot air rising from the ground on a hot afternoon. You can also smell it (what we smell at the pump isn't the fuel going in, it's the evaporated fuel *leaving* the tank). Incidentally, it's this evap that is dangerous and highly flammable, where most petrol station accidents happen.
With that said, I'm still able to consistently get pretty decent mileage (between 6-7l/100km) even if I refill at empty, simply because I let the evap get into the evap tank first. I make sure I let whatever remaining fuel in the tank cool down at least an hour or so before heading out to the petrol station. That way, when I open the fuel cap there's hardly any hissing sound or petrol smell when I'm filling up.
But I got even better mileage last time (tuck han mou yeh chou), every 200km I'll fill up. I averaged 5.5 to 6.5l/100km!
This post has been edited by gregy: May 27 2008, 05:44 AM 
May 27 2008, 12:00 AM
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