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Hey guys

I recently purchase the 2013 EVORA S in atlanta where fuel grade is 93. i will take the car to arizona with me where max you can get is 91. will using 91 damange the engine ? what do you guys suggest?
 

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Disciple of Chapman
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I think 91 would be fine. I think the bigger issue is added alcohol in the gas. here in the Midwest it hard to get straight gas without some methanol in it.
You may get a little less power due to the ECU adjusting to the lower octane, but the car should adjust itself.
 

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Illegal Alien
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One spec car for the whole country so 91 it is, don't know if 93 gives any timing advance. Probable not, just less instances of time retard.
 

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91 is fine, I've been using it for years. I mean, what else are you going to do? Avoid places without 93? Carry 100 gallons of extra fuel in the car?

You could probably get away with 87 is your ECU is stock and don't mind losing some horsepower but your only saving a few bucks each tank -and that's a different issue. 91's fine in absence of 93.
 

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Or, if you are concerned, blend $7 a gallon 100 Octane racing gas (with that pesky lead which ruins your catalytic converter), with 91 octane to raise the overall octane. Or, change your car to run on E-85, which is 105 octane.
 

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I think 91 would be fine. I think the bigger issue is added alcohol in the gas. here in the Midwest it hard to get straight gas without some methanol in it.
You may get a little less power due to the ECU adjusting to the lower octane, but the car should adjust itself.
I'd like to say that it is ethanol that is added to gas. And you actually can get more power from ethanol because it has a higher octane rating than gasoline(ex. modified GTRs are tuned to run on e85 to produce more power than 93 Oct; as well as the koenigsegg agera R). Ethanol has less energy than gasoline so fuel economy suffers.
 

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Someone who is a true gear head can correct me, but modern variable valve timing engines are not as picky about fuel grade as older manual timing engines. The engine will adjust its timing to prevent knocking with lesser fuel, you just get less power. There's a limit, I'm sure, but putting a lower octane on a long trip should not cause anything regrettable.
 

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I've taken a few trips to NE Oklahoma in the Evora & 91 is the highest grade available. The Evora runs fine, but slightly less peppy than with 93. When I was a teenager growing up there we had 94 octane, but haven't seen that in a very long time.

Don't put E85 in your car unless it's tuned for it. You will go into limp mode & get a CEL until it's all flushed from your fuel system. It doesn't really hurt anything, it just sucks all of the fun out of driving. Guess how I know?:rolleyes:
 

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Agreed Missileman120, It won't run right on e-85 from the factory; which is why I said:
Or, change your car to run on E-85, which is 105 octane.
It would minimally require larger injectors, a new tune, and potentially a higher rate fuel pump and replacement of any lines which are sensitive to alcohol. Most fuel lines produced to day are pretty accepting of alcohol, but you never know the British.
 
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