u will be surprised if u only pump half tank instead of full tank for city drive, u will get more mileage...

sanadi Thanks, that's very useful.
In my case, unfortunately it seems I have ordered something similar. The new version is v2.1 IINM. But, these are all cloned anyway, since an original ELM327 costs much more.
Half tank petrol shaves off 30kg @ 0.75kg/l, give or tank.
Though sometimes it's not the weight that improves the FC.

Do you have data?

another "weird" observation of mine is,
the travel is from PG-KL and KL-PG with same weight (me and my bro-in-law, no extra things/luggage) and used auto-cruise at 110km/h all the way
PG - KL >> used 5 bars of fuel
KL - PG >> used 3 bars of fuel

i observed this "behaviour" for few times ady, and i asked around whether its my own car "behave" like that or others' car "bahave" like that also.
but i didnt get satisfied result as some said the route KL-PG is more flat compare to PG-KL is more hilly.

another "weird" observation of mine is,
the travel is from PG-KL and KL-PG with same weight (me and my bro-in-law, no extra things/luggage) and used auto-cruise at 110km/h all the way
PG - KL >> used 5 bars of fuel
KL - PG >> used 3 bars of fuel

i observed this "behaviour" for few times ady, and i asked around whether its my own car "behave" like that or others' car "bahave" like that also.
but i didnt get satisfied result as some said the route KL-PG is more flat compare to PG-KL is more hilly.

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.

u will be surprised if u only pump half tank instead of full tank for city drive, u will get more mileage...

u will be surprised if u only pump half tank instead of full tank for city drive, u will get more mileage...

Hi guys..do anyone experience the cooling fan not running after stopping the engine? Is this normal

Hi guys..do anyone experience the cooling fan not running after stopping the engine? Is this normal

Just do a regular service, and avoid the magnetrap if they offer you (usually they will show you the list of services and the costs first before they proceed to service your car).

If I were you, I will get Syntium 5000 (5/30) for 10k millage, but if they don't have it then get the Syntium 800 for 5k millage.

All in all the service should cost you RM 150+- (without the magnecrap).

what do you mean by magnetrap? their own addons.
example?

going to do my 1k service probably this week.
Since i know didnt know much about car, can anyone tell me what should i check for the 1st service?

another thing is the synthetic oil, i know nothing in this can anyone help?
i know these kind of question have been discussed several times but 50+ pages is a lot for me