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Message
Gasoline - 87 vs 89
Posted on 5/31/16 at 3:09 pm
Posted on 5/31/16 at 3:09 pm
I'm sure that all of y'all, like myself, mostly always get 87... But every now & then I will get 89, just for the heck of it... And it may be in my head but when I get 89 it seems like my ride doesn't drink the gas as quickly... Has anyone else noticed a difference in 87 & 89?
12
Posted on 5/31/16 at 3:10 pm to RegisteredPharmacist
My Lamborghini only takes premium
-the OT
-the OT
Posted on 5/31/16 at 3:10 pm to RegisteredPharmacist
quote:Yes, two.
Has anyone else noticed a difference in 87 & 89?
Posted on 5/31/16 at 3:12 pm to RegisteredPharmacist
quote:yes, the price
Has anyone noticed the difference between 87&89
Posted on 5/31/16 at 3:13 pm to RegisteredPharmacist
Posted on 5/31/16 at 3:14 pm to RegisteredPharmacist
My car recommends premium but accepts anything. MPG and performance are better with the premium.
Posted on 5/31/16 at 3:18 pm to RegisteredPharmacist
If your engine isn't specifically tuned to run on higher octane then you are simply paying more at the pump.
There are people on here that will say a premium only car can run just fine on regular. My understanding is that running a lower grade gas will not kill your engine, but you will have a less complete combustion and thus burn through more fuel. In essence any cost savings you got at the pump will be negated by the decreased mpg.
However, the one fool proof method I learned on the OT is to simply drive faster to get better fuel efficiency.
There are people on here that will say a premium only car can run just fine on regular. My understanding is that running a lower grade gas will not kill your engine, but you will have a less complete combustion and thus burn through more fuel. In essence any cost savings you got at the pump will be negated by the decreased mpg.
However, the one fool proof method I learned on the OT is to simply drive faster to get better fuel efficiency.
Posted on 5/31/16 at 3:18 pm to RegisteredPharmacist
No difference unless you're running a performance car with high engine compression. The higher octane prevents detonation a.k.a. engine knock.
Most factory vehicles are below 10:1 compression
10:1 compression - 87 octane gas
11:1 compression - 92 octane gas
12:1 compression- 92 octane gas
Most factory vehicles are below 10:1 compression
10:1 compression - 87 octane gas
11:1 compression - 92 octane gas
12:1 compression- 92 octane gas
Posted on 5/31/16 at 3:24 pm to RegisteredPharmacist
The BMW asks for premium, but will take 89 without issue.
The Jeep gets 87.
The Jeep gets 87.
Posted on 5/31/16 at 3:27 pm to RegisteredPharmacist
quote:
I'm sure that all of y'all, like myself, mostly always get 87... But every now & then I will get 89, just for the heck of it... And it may be in my head but when I get 89 it seems like my ride doesn't drink the gas as quickly... Has anyone else noticed a difference in 87 & 89?
There is more energy per gallon of the higher octane gas, your car will get somewhat better mileage using premium gas. Most of the passenger cars that specify using premium gas do so is order to meet "CAFE" fuel mileage requirements, not because the engine will be damaged with lower octane. Todays electronic ignition timing and fuel injection systems will adjust as needed to allow the engine to run on the lower octane fuel.
Posted on 5/31/16 at 3:33 pm to RegisteredPharmacist
91 non-ethanol at minimum for my stubborn arse.
Posted on 5/31/16 at 3:38 pm to Shexter
quote:
No difference unless you're running a performance car with high engine compression. The higher octane prevents detonation a.k.a. engine knock.
This is the thing. While you may see some very slight reduction in mileage if you use lower than suggested octane ratings(due to engine performance often related to knock), you will not see an increase for the reverse, since you do not have the higher compression ratio to take advantage of the higher octane rating.
Posted on 5/31/16 at 3:38 pm to RegisteredPharmacist
Tune on my ecoboost is written for 91 octane, and the company pays for it so, supreme all day erry day
Posted on 5/31/16 at 3:53 pm to RegisteredPharmacist
No such thing as mid-grade gasoline. Its just a mix of regular and premium. Most stations don't even have a mid-grade tank. 
LINK
LINK
Posted on 5/31/16 at 4:00 pm to EA6B
quote:
There is more energy per gallon of the higher octane gas
Nope, Octane is not a measure of energy available. In fact, generally speaking, Higher Octane means lower Heating value (BTU/lb or BTU /gal).
However, higher octane allows for higher compression ratios. Higher compression rations in an Otto Cycle (4 Cycle) engine is the only real way to increase power efficiency of an engine, all else (like friction) being equal.
Posted on 5/31/16 at 8:36 pm to CtotheVrzrbck
quote:
91 non-ethanol at minimum for my stubborn arse.
BR only sells 87 non ethanol
Posted on 6/1/16 at 9:52 am to uptownsage
Did some control work on a gasoline loading rack for Mobil in Rhode Island in the 90s. Eye opening experience. They had two grades of gasoline Don't recal the low grade but I think it was 87 but may have been 86 or 85. High grade was 104. Every major brand in the area got their gasoline there. Exxon, Mobil, Chevron, Texaco, Shell, BP and several less familiar in this area, like Sunoco (I recall them in particular because they offer 104 octane gasoline).
Tankers were filled with a mixture from the 2 tank batteries in proportion to give the octane rating they needed while adding the dditive packages for that particular mix (those were supplied to Mobil by the individual manufacturer and metered into the fuel flow as the tanker filled, the quantities are very small by volume).
Additives are the only real difference between gasoline and I suspect if you looked at the actual chemical formulas for major brand additives, you would see only marginal differences.
Tankers were filled with a mixture from the 2 tank batteries in proportion to give the octane rating they needed while adding the dditive packages for that particular mix (those were supplied to Mobil by the individual manufacturer and metered into the fuel flow as the tanker filled, the quantities are very small by volume).
Additives are the only real difference between gasoline and I suspect if you looked at the actual chemical formulas for major brand additives, you would see only marginal differences.
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