Mixing different grade of gasoline from one brand/station

[Stigg ma]

Hello my fellow tsikot...

any chemical engineer specializing in fuel or someone in the fuel industry here?

for example i have a 42L gas tank, a toyota Vios 2NZ-FE engine,

upon 2nd low fuel warning (fast blink) i fill up Shell VPower NitroPlus RON95 * 20L + Shell Fuel Save RON91 * remaining capacity lets say 19~20L to make it a full tank

both grade of fuel from same gas station...

now, what are the advantage and disadvantage of doing this?

[brainmafia_310]

Good at may nakapagtanong nito.

Ang labo kasi eh may mga fuel combi ako na sablay.

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[dr. d]

if i have to guess..
knowing that "pure" gasoline is just a mixture of various hydrocarbons and additives, all of which conspire to give it a certain octane rating, mixing equal volumes of 95 octane fuel and 91 octane fuel, gives you 93 octane fuel...
if this is correct, then the disadvantage is, you are doing it the hard way..
i know some people who use 3 tankfuls of 91 octane, followed by 1 tankful of 95 octane. they say it cleans the engine..

[nivraarvin]

Disadvantage:

Your ECU will need to re-learn the new mixture in your tank. The ECU monitors the sensors in your car's engine and exhaust.

It may take 1 minute, 1 hour, or 1 day.

Nothing harmful naman.

[brainmafia_310]

Disadvantage:

Your ECU will need to re-learn the new mixture in your tank. The ECU monitors the sensors in your car's engine and exhaust.

It may take 1 minute, 1 hour, or 1 day.

Nothing harmful naman.

numbers alone is good.

pero what about the chemical composition ng additives, kasi parang nun nagmix yung blaze at xtreme 97 ng seaoil dati, parang ang gaspang ng anadar ng kotse ko tipong hindi naman erratic ung rpm pero sa acceleration parang may time na oks may time na hindi at same rpm range.

[nivraarvin]

numbers alone is good.

pero what about the chemical composition ng additives, kasi parang nun nagmix yung blaze at xtreme 97 ng seaoil dati, parang ang gaspang ng anadar ng kotse ko tipong hindi naman erratic ung rpm pero sa acceleration parang may time na oks may time na hindi at same rpm range.

Yes. That's why sometimes it feels sluggish after 1 tank of Brand A, then pag mauubos na, you load up with 200php of Brand B.

Of course Brand A will be different from Brand B in terms of composition and the additives used.

That's why the ECU will need to adjust it self to the new mixture of fuel you have in your tank.

[brainmafia_310]

Yes. That's why sometimes it feels sluggish after 1 tank of Brand A, then pag mauubos na, you load up with 200php of Brand B.

Of course Brand A will be different from Brand B in terms of composition and the additives used.

That's why the ECU will need to adjust it self to the new mixture of fuel you have in your tank.

agree Sir, pero its like hindi pa din pantay ung hatak or power niya kahit naalog na at nahalo parang may certain CC na mababa ROn may certain CC na mataas ron.

i also agree on the post above by sir niky, it just got me thinking na baka sa additives ng different brand nagkakatalo.

[jresperanza]

This sounds interesting since wala na RON93 ngayon

[leodawesome]

agree Sir, pero its like hindi pa din pantay ung hatak or power niya kahit naalog na at nahalo parang may certain CC na mababa ROn may certain CC na mataas ron.

i also agree on the post above by sir niky, it just got me thinking na baka sa additives ng different brand nagkakatalo.

I'm also wandering on this, pano nga ba natin masasabi na nahalo na yung 2 different brand of fuels that we mixed? Minsan din kasi while driving after mixing up, same RPM range minsan swabe, minsan naman sluggish. Could it be that the additives of 2 different brands, or lets say the fuel itself are not entirely being 'homogeneously mixed'? Kung anong part lang yung mahigop ng engine, yun na yung prevailing fuel that was used on that particular push on the pedal?

[niky]

As long as the RON of the final mixture is higher than the minimum required RON for the motor, no harm, no foul.

At worst, it'll run a bit differently as the timing gets pulled back (some modern engines take advantage of high RON fuel to advance spark timing, which makes more power), but there should be no issues at all.

[jut703]

It shouldn't be a problem at all.

Base fuel between 91 and 95 is different, but the ethanol is the same. The additives are different but technically they can be mixed with any base unleaded fuel.

We don't advise against mixing fuels, but of course you don't get the full benefits of the superior fuel (i.e VPN+ vs FS Gas) if you only have 200 php of it in a tank filled with mostly regular unleaded.

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[lowslowbenz]

Re: gasoline ....... pare-pareho lang yan.

How will you people know the difference of 91 RON to 95 RON? Aside from reading the label in front of the gas pump?

Color?
Smell?
Taste?
Bring it to an independent chem lab and have it analyzed?

My point is this ... Until we hapless consumers can find a way to REALLY determine what the petroleum companies say about octane ratings, fuel savings, super power this, diesel booster that, blah, blah ...... we would just have to bite the nail on the head, grin and bear it.

Because when that fuel reserve light blinks, you have no choice but to dive at the nearest gas station and top up.

[jut703]

Re: gasoline ....... pare-pareho lang yan.

How will you people know the difference of 91 RON to 95 RON? Aside from reading the label in front of the gas pump?

Color?
Smell?
Taste?
Bring it to an independent chem lab and have it analyzed?

My point is this ... Until we hapless consumers can find a way to REALLY determine what the petroleum companies say about octane ratings, fuel savings, super power this, diesel booster that, blah, blah ...... we would just have to bite the nail on the head, grin and bear it.

Because when that fuel reserve light blinks, you have no choice but to dive at the nearest gas station and top up.

Well I can assure you that there's a difference between regular unleaded (e.g. FuelSave Gas, Silver, etc) and premium unleaded (V-Power, XCS, etc):

1. Base fuel is different - the base fuel (without additives or E10) has a different octane rating for regular and premium unleaded

2. Additives are different - the additives that one company uses for their premium gas is usually not the same as that of their regular gas. It is also important to note that all the claims you here on the radio or on TV have to pass through a claims table, and we cannot claim anything that isn't true. That said, as with any marketing spiel, it is about sending out the message as effectively as possible, and this includes exaggerations, or to be more politically correct, creative communications.

Take note though that the base fuel of each oil company is different. Mixing Petron base fuel with Shell additives will result to weird looking substances despite being chemically identical.

Also take note that for independent players, local regulations are poor with regards to controlling where they get their fuel. Most of it is imported as finished goods - possibly of better quality, but also possibly inferior to the ones refined locally. Euro IV this and Euro V that are good marketing ploys, but again the quality control for these smaller players is really shoddy.


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[jhnkvn]

There's sometimes a gap in differences on paper and differences on the road.

The +10hp a 1.6L displacement engine might get from a more energy-dense fuel is useless whenever you play EDSA as an example.

There are differences in fuels. True. However these differences aren't really what we call "major differences" that we can quantify on a practical daily basis. Most of the "gains" is simply felt by placebo. Case to point:I've never sat in a car and successfully managed to guess which gas they use.. whether it's a daily driven vehicle or a Civic SiR doing track runs in Batangas. That is unless I obviously expect it to.. like a Ferrari.. where the high compression engine practically means it's sipping on Blaze 100 equivalent fuel. Even then, I might be wrong -- malay mo race fuel na Octane 113 gamit at pinaimport lang?

I understand that owners themselves say "X is better than Y" in fuel economy, power, etc. on my ride. However the fundamental premise is always invalidated is because the variables (how much pressure you step on the gas, how frequent did you use it, was any accessory putting an additional load, etc.) is not controlled. Kahit ano gawin mo, user experiences are flawed to begin with and as such is an unreliable data source.

I keep on telling people, the only time a fuel can have more power is if it's more energy-dense than your comparison standard. Nothing more, nothing less. I'm not even taking account the entire car.. just the fuel.