Gas

Asked by Jul 05, 2016 at 07:09 PM about the 2006 Chevrolet Cobalt LT Coupe

Question type: General

I drive a 06 cobalt Lt coupe....I was told that higher
octane gas would do me good. I did research and
found an article that says if it doesn't say
something like "unleaded only" that it would be OK.
I'm not going to use race fuel or anything but I
wanted to have a few more HP without putting
work into it because I'm not a car guy. Can anyone
clear this up?

3 Answers

228,295

Your cobalt will run great on 87 Octane or the recommended fuel. Higher octane is for higher compression engines, which you car does not have. Save your money.

1 out of 1 people think this is helpful.
Best Answer
70

If you know what engine size you have type in the compression ratio for that size engine on Google, if it's under 9:1 than putting anything over regular gas is a waist of money, premium gas is designed for engines that have a higher compression than 9:1. If you have under 9:1 and your running premium gas your not ganging any benefits your just wasting gas literally it won't burn it all and just force it out of the exhaust and create more deposits in your engine

3,775

Use whatever your owner's manual says you should use. GM spend a bazillion dollars figuring all that out and programming your computer run the engine at peak efficiency with a certain . You're not going to outsmart the GM engineers by changing fuel and you may in fact make it run worse because the different octane level could make it operate at a different temperature which the computer will interpret as a problem of some sort and start compensating for it or showing trouble codes.

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