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I'll trust the GM engineers who designed our cars to run on 93 before some random Internet Website. The difference in the price of gas is a few dollars per tank. A new engine costs $4500 or so.
I'm sticking with what works, however I'm more burned that the gas companies are now charging 0.20 between grades unlike the days when it used to be only 0.05 or 0.10 between grades.
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While it's true that some car makers recommend putting premium fuel in their high-end models, what about most of us who drive regular cars?
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We fall into the "high-end models" category. I am assuming they will be speaking to the uninformed general public that drives Toyota corollas that think they are being proactive in using premium. The fact is, if you don't have the compression and timing to require the higher octane, you really are throwing your money away.
I'm not going to try my luck with my high compression setup (>11.1 to 1).
My car is tuned specifically for 93.
Mine is 12:1 and tuned to 93, but the Mayhem guys said for HPDE I might want to mix in half a tank of 100. Either that or some Torco. They said I was on the edge of the envelope for 93 and they're not sold on the quality of some brands of 93. Better safe than sorry.
I'll trust the GM engineers who designed our cars to run on 93 before some random Internet Website. The difference in the price of gas is a few dollars per tank. A new engine costs $4500 or so.
If you are running on vapors at $0.20 a gal more it would take $3.60 more to fill your tank.
I think that's small change unless you are burning a tank a day.
You could save more money and be much healthier by staying out of McDonalds.
So I think I will save the $3.60 by not buying the Mtn Dew and Cheetoes every time I fill up...I also use the Gas Buddy app to find the best price. Looking at it right now in the Everett, WA area it ranges from $3.69-$4.39 in a 4 mile radius....
Last edited by Johnz02Z06; Nov 2, 2012 at 01:28 PM.
My near stock 02 C5 is fine with GM's recommended 91 oct.
My highly modified 98 C5 and highly modified Eagle Talon are tuned for 93 oct.
My Expedition gets whatever is cheapest which is 89 oct here in Iowa.
If you are running on vapors at $0.20 a gal more it would take $3.60 more to fill your tank.
I think that's small change unless you are burning a tank a day.
You could save more money and be much healthier by staying out of McDonalds.
If my math is correct, at $3.60 per tank it would take 1,250 tanks to equal the cost of a new engine. That's roughly 437,500 miles at 350 miles per tank.
what the op said is the last place i would look for information
there is PLENTY of good material a person can research on compression and engine timing to see the effects of octane and the burn rate during the combustion process
you guys running 87 octane are really playing with fire at high rpm. when the engine is spinning 4-6k rpm for any length of time the piston tops get hotter. add in low octane gas and your chance of detonation went up substantially. high piston temps and turbulent combustion from the flame not burning long enough is a very easy way to crack top rings and or piston ringlands.