QUOTE(alexei @ Apr 28 2014, 01:42 PM)
My Google results show it is urban myth, unsubstantiated with data.
This is not my first time looking into this idea, but I'm open to new findings.
Theories are abound, no less.
This is my search term "half tank full tank mileage".
Personally, I've measure these few methods:
- Full tank and refuel at empty
- First half tank and refuel
- Second half tank and refuel at empty
My data shows that there is no long term difference. I now drive with full tanks, stopping the refuel as the pump clicks to stop.
Newer cars, Preve included I
presume, have fuel tank pressure relief, by sending petrol fumes to air filter box, that's why when you open petrol cap, there is no escaped pressure.
In theory, the extra fume burnt off, are compensated by reduced fuel at injector, as it can be detected by O2 sensor.
My recent experience didn't observe this.
Perhaps it's more to do with elevation? Penang is 3m above sea level, and KL is 21.95m.
Or, different brands of petrol? In my data, brand P******* is better than S****, E***, B** and C*****. However, other drivers may not agree based on their experience
Also, the time when you travel plays a role, too. Example: If PG-KL is in the morning, vs KL-PG in the afternoon.
Factors: Air density higher when cool, air con usage longer when hot, etc. My RM0.02.
no long term difference?
hmm...maybe for u only...but for me, with RM50 i can go at least 200km, or 250km+- compare to RM100 i can go no more than 400km...but this is city drive
for highway drive, full tank or half tank same, no difference.
i only pump petron, unless no choice ady no more blinking, pump other brand.
why ur data need to hide the brand name?
for the KL-PG and PG-KL route, i used only Petron RON95. i believe it is more to elevation. but where u get this elevation data from google search? can share the link?
petronas
for my car give s best mileage, then BHP/Petron, then Shell, then Caltex (all RON95).
but difference car difference characteristics, i tested all brand petrol as soon i get my car.
now,
for my car, Petron gives better mileage and acceleration (based on my feeling), even though Petronas gives best mileage but no power and makes engine noisy when accelerate.
forgot to add, travel at what time also same, still 5 bars PG-KL and 3 bars KL-PG
This post has been edited by arthur88: Apr 28 2014, 02:17 PM 
Mar 21 2014, 11:03 AM
Quote
0.0464sec
1.23
7 queries
GZIP Disabled