Sabena332 From , joined Dec 1969, posts, RR: Posted (8 years 11 months 4 weeks 1 day 11 hours ago) and read 1986 times:
Since a few months, a lot of petrol stations offer a new kind of gasoline here in Germany. Aral is offering their "Ultimate 100" and Shell is offering their "V-Power 100". They praise this stuff in ads and tv-commercials because it has 100 octane, supposedly it should give the following advantages:
It enhances the power of the motor
It decreases the exhaust
It reduces the fuel consumption
It enhances the life-time of the motor
Since I will get my new Mercedes SLK on Wednesday (Yay ), I might try this gasoline despite it is 10 Cent more expensive per liter than the regular stuff.
Has anyone experience with premium gasoline? Are all these promises true, will it increase the power and will it reduce the fuel consumption or is this only a new way for the gasoline companies to rip-off the customers?
Luisde8cd From Pitcairn Islands, joined Aug 2004, 2521 posts, RR: 32 Reply 1, posted (8 years 11 months 4 weeks 1 day 10 hours ago) and read 1911 times:
Here in Venezuela we only have 95 octane unleaded and 91 octane leaded. I bought a '98 Mitsubishi Eclipse in Texas and I used regular unleaded (that's less than 85 octane I believe) while living there. Then I moved back to Venezuela and I shipped my car from HOU to CCS. In here I use 95 octane unleaded and it does feel a little better than with texan regular unleaded gas.
174thfwff From , joined Dec 1969, posts, RR: Reply 3, posted (8 years 11 months 4 weeks 1 day 10 hours ago) and read 1903 times:
My 1999 VW Passat 1.8 Turbo sure liked it more when I put premium gasoline in there. Overall, it was giving me better mileage, more HP...however don't go putting premium gas into your car if it doesn't need it...then it's a waste.
Thumper From United States of America, joined Nov 2001, 550 posts, RR: 0 Reply 6, posted (8 years 11 months 4 weeks 1 day 10 hours ago) and read 1877 times:
I have a Acura 3.2 TL,and it calls for premium gas. I have run 87 octane regular gas in it for 3 years and had no problem! It has plenty of power and gets over 20 miles per gallon. Getting ready to trade it in for a 2005.
DeltaGuy From , joined Dec 1969, posts, RR: Reply 7, posted (8 years 11 months 4 weeks 1 day 10 hours ago) and read 1877 times:
Shell V-power is just a big joke...costs too much anyways, you're just paying for the name.
On my 2000 Camaro, I have to use premium. I have a 5.7L 346ci engine in it (same as the Corvette), with a 10.5/1 compression ratio (which is a pretty high ratio)....if you use 87, you'll get detonation, basically because the fuel you're using is crap and it isn't burning correctly. When I did try regular unleaded, or if it's the only thing a station has, my engine will run like crap and knock, etc etc. Premium gives it a little more power too.
When I put new race heads/bigger camshaft on her, my compression ratio will probably be around 12/1....premium may even not be enough, I may have to start buying aircraft fuel lol...or just use octane additive.
Aerobalance From United States of America, joined Sep 2000, 4664 posts, RR: 50 Reply 8, posted (8 years 11 months 4 weeks 1 day 9 hours ago) and read 1872 times:
Definitions of 'engines that need premium' fuel...
If your engine has:
1. A high amount of total spark advance.
2. A high compression ratio.
3. Poor heat transfer qualities of the cooling system in the cylinder head.
Any one item or combination of the above warrants the use of higher octane fuel.
Thus My '87 Mustang GT and 05' BMW 325i both need Premium fuel to achieve there rated HP, especially on warm days. If I use any less octane, the GT does not have a knock sensor so it will just rattle itself to death and have decreased HP, while the BMW's computer system will sense knock and retard the spark curve so HP will thus be decreased....
Cptkrell From United States of America, joined Sep 2001, 2855 posts, RR: 13 Reply 9, posted (8 years 11 months 4 weeks 1 day 9 hours ago) and read 1862 times:
Read your owner's manual for minimum octane requirements before going to the added expense of 100 octane (I wonder how they achieve that anyway...MMT, magnesium metallic?). In some unique cases, a higher octane will be helpful, ie: when traveling through hilly country with a real load, my pickup truck will run better with 89 rather than the normal and recommended 87 octane.
Your new SLK may require premium; some US cars such as the Corvette do, but most new performance cars, such as our 300 Hemi require only 89 (as a matter of fact, my owner's manual states: "The use of premium gasoline is not recommended."). As folks have mentioned above, unless required, it's likely a waste of money. You'll probably be better served by religously changing your (synthetic) oil and filter at recommended intervals. Regards....Jack
Turbulence From Spain, joined Nov 1999, 963 posts, RR: 22 Reply 10, posted (8 years 11 months 4 weeks 1 day 8 hours ago) and read 1852 times:
OK, most people have said it as it is: use of more octane than minimum required is a waste of money.
And please note something: MORE OCTANE GAS DOES NOT PERFORM BETTER.
The octane level describes a protection ratio for compression and spark advance, (engines that have higher output) and thus they need higher octane. This does not mean that a higher octane gives higher power. This is just commercial. If it was that easy, you could use 120 octane in your engine and get more power. They would have invented 200 octane gasoline. Be serious.
There is ONLY ONE car thaat performs better with higher octane: the SAAB 9-3 and its adaptative spark cartography, that advances the spark always to the detonation limits. Use of higher octane fuel will accept more spark advance.
I have a BMW M3 with four easily choosable cartographies: for 95 (european super unleaded), 98 (european extra unleaded), 97 (old european super leaded) and... 91 (american premium). I have been running her for the last eight years on 98-cartography using 95 and nothing happened. She has 175.000 kms and works like a swiss clock.
One day, I tried the 91 cartography and the power above 3.000 rpm was exactly the same, and acceleration times too. The only difference was a weak torque below 2.500 rpm and an absolute lack of it below 1.500. But HEY!!!... this was not because of the gasoline (I cannot find american gas where I live, it was actually burning 98 when I tried it), it was because of the cartography.
So, if your car does not have a self-adaptative cartography, or one you can program, whatever kind of difference you may feel is entirely SUBJECTIVE / PSYCHOLOGIC.
Turbulence From Spain, joined Nov 1999, 963 posts, RR: 22 Reply 13, posted (8 years 11 months 4 weeks 1 day 4 hours ago) and read 1800 times:
This might be because increases power output by advancing ignition
Side note about compression:
Compression relatively affects for this matter, I've just remembered that my Honda VFR-750-F has a compression rate of 11,9:1 or 12,2:1 -not able to recall at this moment- and despite this it can use any gasoline or mixture of gasoline and alcohol or pure alcohol (not etilic, off course, but the kind of automotion alcohol used in Brazil) with a minimum octane index of 91. And actually, back in 1992 we still had the old leaded regular gas, 92 octane, which I used once.
The explanation here comes from the turbulence (nothing to do with my username here... hehehe...) that the admission is able to generate, by accurate design of the admission pipes, the valve angle, the spark plug position and maybe irregular shapes on the piston head so the air spins at extremely high speeds during compression.
174thfwff From , joined Dec 1969, posts, RR: Reply 14, posted (8 years 11 months 4 weeks 1 day 3 hours ago) and read 1789 times:
That's exactly what it did. It reprogrammed the computer. Audi-VW used the 1.8t in numerous cars, and the ECU is what pretty much was the reason why the horse power figures between the Passat, A4, and a few other cars were as different as they were...I loved it until I got the Envoy and now it's just 6.5 mpg of fun
USAFHummer From United States of America, joined May 2000, 10685 posts, RR: 53 Reply 16, posted (8 years 11 months 4 weeks 1 day 3 hours ago) and read 1780 times:
On this topic, can anyone explain why at high-altitude gas stations, the octanes sold are lower? Here in Colorado, elevation 5,300 ft. we have octanes from around 85-90...while back east at sea level, the octanes range from 87-94...
Chief A.net college football stadium self-pic guru
AIR757200 From United States of America, joined Jul 2000, 1579 posts, RR: 8 Reply 18, posted (8 years 11 months 4 weeks 1 day 2 hours ago) and read 1763 times:
My Grand Prix requires premium fuel (min. octane 91)... I always buy 93 and 93 has become the normal "premium" fuel in the Detroit area. CITGO*, Sunoco, and Speedway use to sell 92, but I've noticed many have switched to 93 premium standard like Mobil, Shell, BP-Amoco. But, I guess it just really matters where you live.
*I stopped at a CITGO the other day and the pump had 87, 88, 89, 91, and 93 octane fuel types. All within about three-cent difference.
DeltaGuy From , joined Dec 1969, posts, RR: Reply 19, posted (8 years 11 months 4 weeks 21 hours ago) and read 1725 times:
I see that at Citgos sometimes too lol...funny stuff.
If I use the 87 crap, my two knock sensors will retard that timing curve, hence why the car will run like shit with 87...bucks a little too. During the hurricanes here in FL, 87 was the only thing available, so not only did I have pouring rain on my 'maro, but I had knock too...goodie!