Premium gar vs. regular: What's really better for your car?

[MightyMouseTech]

Originally Posted by Delta0311

I heard that peeing in your gas tank boost octane.

Only after a night of binge drinking.

[Delta0311]

Originally Posted by MightyMouseTech

Only after a night of binge drinking.

Right.. That extra ethanol helps..

[Alfisti]

Originally Posted by SunnyD

I hope you're not choosing to run 87 octane based on cost savings...we're talking about a difference of $2 for 16 gallons based on a $.13 per gallon difference.

Over here it is a solid 20c per litre, so the better part of a dollar a gallon. 87 is about $5.50 gallon, 89 is circa $6.50 and 91 about $6.75 gallon.

It really bugs me, my next family hauler will not be a premium gas engine, I only do 12,000 Km a year so it's only costing me what ... circa $300 a year extra for premium but really .. it shjits me to tears.

[Delta0311]

Originally Posted by Alfisti

Over here it is a solid 20c per litre, so the better part of a dollar a gallon. 87 is about $5.50 gallon, 89 is circa $6.50 and 91 about $6.75 gallon.

It really bugs me, my next family hauler will not be a premium gas engine, I only do 12,000 Km a year so it's only costing me what ... circa $300 a year extra for premium but really .. it shjits me to tears.

I was paying less than $3.00/gallon for 93 yesterday.

[dmkdrum]

Originally Posted by Delta0311

I was paying less than $3.00/gallon for 93 yesterday.

cool story bro. no need to be an asshole. man, there's a ton of assholes here isn't there. I watch a news report and ask a freaking question. why the question means I'm an idiot and should berated is beyond me? not everyone knows how this works. and because someone wants to own an M4 means they don't want to ever save money on anything? I'm just made of money? you mean I couldn't have just done a good job of saving in order to get into the car? Jesus Christ. way to make people feel welcome here. someone could have easily just stated that it wouldn't work for the car. you think I don't realize they used a different car for the test? no shit. but the guy in the report even said his car requires 91 and he doesn't use that. so why this is such a dumb thread and dumb question is beyond me. why you people even feel the need to comment on this when you have nothing better to say other than how dumb this is is beyond me. super helpful people here.

[Delta0311]

Originally Posted by dmkdrum

cool story bro. no need to be an asshole. man, there's a ton of assholes here isn't there. I watch a news report and ask a freaking question. why the question means I'm an idiot and should berated is beyond me? not everyone knows how this works. and because someone wants to own an M4 means they don't want to ever save money on anything? I'm just made of money? you mean I couldn't have just done a good job of saving in order to get into the car? Jesus Christ. way to make people feel welcome here. someone could have easily just stated that it wouldn't work for the car. you think I don't realize they used a different car for the test? no shit. but the guy in the report even said his car requires 91 and he doesn't use that. so why this is such a dumb thread and dumb question is beyond me. why you people even feel the need to comment on this when you have nothing better to say other than how dumb this is is beyond me. super helpful people here.

We understand bro, it's that time of the month. We look out for each other here so let me help you out.

We take it you are a gentle flower.

[dmkdrum]

Originally Posted by Delta0311

We understand bro, it's that time of the month. We look out for each other here so let me help you out.

We take it you are a gentle flower.

hahahaha omg you're so funny! sit behind the anonymity of your keyboard doucchebag. there's no way you'd make it this far in life if you acted like this in real life in front of people without getting your ass kicked. so sit behind your keyboard and have fun. it's too bad that the people that get harassed online take it out by taking out innocent people and not the dicks like you.

[Delta0311]

Originally Posted by dmkdrum

hahahaha omg you're so funny! sit behind the anonymity of your keyboard doucchebag. there's no way you'd make it this far in life if you acted like this in real life in front of people without getting your ass kicked. so sit behind your keyboard and have fun. it's too bad that the people that get harassed online take it out by taking out innocent people and not the dicks like you.

My pics is up right in my profile so I AM NOT HIDING. I can quite assure you that I act like this in real life and I don't get my ass kicked. I'm no MMA all star but I can handle myself and I got enough weight behind me to back my blows. Yes I might be a dick but I am also pretty quick to help people. For instance I went out of my way to find a E9x manual and show you what BWM recommends we use when filling up. In my first comment I implied that an owner of a performance based BMW should be using higher tier gas without question.

[ShocknAwe]

Originally Posted by dmkdrum

why you people even feel the need to comment on this when you have nothing better to say other than how dumb this is is beyond me. super helpful people here.

There were lots of helpful posts before you ignored all of it and asked the question a second time, in a different way. There were even helpful posts after that.

You asked a question, got an answer, and then asked, "well why should I, the video was good" (essentially) and got offended at the mildly harsh responses.


Let me ask you another question:
Should I stop at a red light? It says in traffic law that I should, but it would be so much faster if I didn't!

Same thing with the minimum 91 RM/2 octane notice on your car behind the gas filler door. It's listed as a minimum, not recommended. Recommended is 93. Just do it.

[MightyMouseTech]

I am much bigger asshole in real life.

[rjd598]

can't believe a so called car expert believes regular is all you need. then again guys don't forget this is geared towards to the millions who drive normal cars that actually only need 87. i hope people who own more performance orientated cars know to follow manufacturer recommendations...

[MightyMouseTech]

Or just use whatever it says in the owners manual to use.

Not a tough concept.

[MTTH]

lolololololol great.

[Delta0311]

Originally Posted by MightyMouseTech

I am much bigger asshole in real life.

I mean why else would you be driving a BMW.. Duh!!

[MTTH]

One simply does not put regular gas in a Motorsport car. I know you're not considering buying an M4 just to keep the RPMs under 3K.

[Chihuahua]

Oil thread coming next?

[Nitrousbird]

Originally Posted by SunnyD

we're talking about a difference of $2 for 16 gallons based on a $.13 per gallon difference.

No where around here has the price difference that small. Typically $.30 to $.40 with Costco sometimes being the exception at around $.18 to $.25 (and that's not consistent...I've seen them at $.30+ as well).

Originally Posted by BavarianDevil

I'm new here but I agree. Why bother with 87. I've been told from others much smarter then me that you get better overall gas mileage with premium. Who knows. just use premium and be happy you can.

That's not true either. You want to run the lowest octane possible without having knock occurrences. That will get you the most power/fuel mileage. Going under that need will caused pulled timing where you need it most = lower fuel mileage and power. The proper answer is to use the octane needed for the specific application.

[i M HOONIGAN]

Originally Posted by Delta0311

I heard that peeing in your gas tank boost octane.

This is the dumbest thing I've read... Urea is for diesels. OP, just get the 87 octane, run in and get a bottle of NOS energy drink, and top off the tank. I heard Full Throttle works too, but not unless you're wide-open-throttle the whole time.

[csu87]

Originally Posted by dmkdrum

hahahaha omg you're so funny! sit behind the anonymity of your keyboard doucchebag. there's no way you'd make it this far in life if you acted like this in real life in front of people without getting your ass kicked. so sit behind your keyboard and have fun. it's too bad that the people that get harassed online take it out by taking out innocent people and not the dicks like you.

[AW335TT]

Id be curious to see what the actual difference is.

2 M4s should do some side by side runs, first both cars run 91, then one car runs 87, then other car runs 87.

[David70]

Originally Posted by AW335TT

Id be curious to see what the actual difference is.

2 M4s should do some side by side runs, first both cars run 91, then one car runs 87, then other car runs 87.

I would be far more interested in multiple cars, multiple conditions and then also determining fuel mileage loss. I don't see the above being enough to matter tell much with all of the other variables. Then is the engine avoiding all detonation or cutting back as it detects it (some still occurring)

In the end it's like going to a high end restaurant and buying the cheapest draft beer (not because you like it) so you can same a couple of dollars. If the high end restaurant price is too high, just don't go.

If you bought a new M3 in 2013 (latest year they have), kept it for 5 years and then sold it Edmunds estimates this will cost you about $80k. Basically about $1300 a month. Figuring out a way to make this $1280 a month isn't going to matter.

http://www.edmunds.com/bmw/m3/2013/s...8/cost-to-own/

[wdb]

Originally Posted by Nitrousbird

You want to run the lowest octane possible without having knock occurrences. That will get you the most power/fuel mileage. Going under that need will caused pulled timing where you need it most = lower fuel mileage and power. The proper answer is to use the octane needed for the specific application.

Most cars built in the past 10-15 years have knock sensors, little gadgets bolted to the block that will pick up knock and send a signal to the control computer. They're capable of detecting knock long before human ears ever hear it. Which is not to say that you will never hear it, after all the computer has to act on the signal, and how/when it does that will determine whether a human will hear an engine knocking.

In short: no, the lowest octane that does not produce audible knock is not the correct one for your car. The correct octane for your car is the one the engineers who designed the engine and control systems tell you to use.

Originally Posted by AW335TT

Id be curious to see what the actual difference is.

2 M4s should do some side by side runs, first both cars run 91, then one car runs 87, then other car runs 87.

I poked around a bit and did not find any such test. I'd be interested in the results too.