Mixing different grade of gasoline from one brand/station

[kapitan88]

91RON na lang ata ngayon sir ang Xtra.

Petron Xtra is 93. My 2NZ is happier on Xtra than XCS.

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[Stigg ma]

wait, lets start from simple setup muna...



From a single brand and a single gas station muna tayo to minimize the variables...



What would happen if i mix 50/50 or something near 50/50 of RON91 and RON95 of shell???



why shell? because ever since i had this car i tried petron, caltex, total, shell (all RON93), only shell felt good so i constantly used shell RON93 back then, but now its phased out, RON91 nalang, my MultiInfoDisplay shows better gas mileage when using RON95 (an additional max 5 KM/L) but RON95 is more expensive than RON91

[nivraarvin]

wait, lets start from simple setup muna...

From a single brand and a single gas station muna tayo to minimize the variables...

What would happen if i mix 50/50 or something near 50/50 of RON91 and RON95 of shell???

why shell? because ever since i had this car i tried petron, caltex, total, shell (all RON93), only shell felt good so i constantly used shell RON93 back then, but now its phased out, RON91 nalang, my MultiInfoDisplay shows better gas mileage when using RON95 (an additional max 5 KM/L) but RON95 is more expensive than RON91

Basis: Pure gasoline (without ethanol)

95 octane (95% iso-octane 5% n-heptane) will have a higher heat of combustion than 91 octane (91% iso-octane 9% n-heptane).

Meaning, 1 tank of 95 octane will have a higher energy content than 1 tank of 91 octane gasoline.

Whether your engine is efficient enough to extract and convert that into a noticeable power gain is another question.

It is more likely that you do not feel the need to press the throttle pedal a bit more when using 95 octane gasoline because you feel "normal" when accelerating compared to the "sluggish" feel you get with 91 octane. To compensate, you press the throttle a bit more.

If you want more octane rating, small players out there are offering 97 octane fuels with the price of xtra unleaded/fuel save, sometimes a bit cheaper. I stopped using "big 3" fuels for about 2 years now. I do feel the small players offer better fuels than the big 3, with the exception of Blaze.

[JohnM]

91RON na lang ata ngayon sir ang Xtra.

It's 93 on C5 SB near Market Market according to their labeling.

[madduck]

It's 93 on C5 SB near Market Market according to their labeling.

maybe that's the XTRA Advance

[jresperanza]

Basis: Pure gasoline (without ethanol)

95 octane (95% iso-octane 5% n-heptane) will have a higher heat of combustion than 91 octane (91% iso-octane 9% n-heptane).

Meaning, 1 tank of 95 octane will have a higher energy content than 1 tank of 91 octane gasoline.

Whether your engine is efficient enough to extract and convert that into a noticeable power gain is another question.

It is more likely that you do not feel the need to press the throttle pedal a bit more when using 95 octane gasoline because you feel "normal" when accelerating compared to the "sluggish" feel you get with 91 octane. To compensate, you press the throttle a bit more.

If you want more octane rating, small players out there are offering 97 octane fuels with the price of xtra unleaded/fuel save, sometimes a bit cheaper. I stopped using "big 3" fuels for about 2 years now. I do feel the small players offer better fuels than the big 3, with the exception of Blaze.

this is a nice idea, eliminating out the 10% ethanol...

the question here is now its based on 10% ethanol, as what i know, more ethanol = increased octane = more expensive gasoline / less ethanol = decrease octane = cheaper gasoline

would mixing the RON91 + RON95 in equal parts result to justifiable savings or just a waste of time and money and possible chemical reaction consequences?

[nivraarvin]

this is a nice idea, eliminating out the 10% ethanol...

the question here is now its based on 10% ethanol, as what i know, more ethanol = increased octane = more expensive gasoline / less ethanol = decrease octane = cheaper gasoline

would mixing the RON91 + RON95 in equal parts result to justifiable savings or just a waste of time and money and possible chemical reaction consequences?

I eliminated ethanol to make it more simple.

Ethanol has less energy content than gasoline, BUT has a higher octane rating. I said rating because octane number is different from octane rating.

Remember when extra unleaded was RON 93 before then extra unleaded with ethanol first came out and it had RON 95 and it was actually cheaper than the ethanol-less extra unleaded?

In terms of cost, case to case basis parin. Sometimes, loading up with a more expensive fuel gives you the urge to floor it (pwedeng placebo kasi you sense more power).

If you want find out what is more economical, you have to test it for yourself and find out what works for you.

[s10pao]

I said rating because octane number is different from octane rating.

ano pinagkaiba nila?

[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.