Engine compression will determine what octane gas you should use in your vehicle to get the maximum performance.gobuds said:check out the link below, recently on the front cover of USA Today, great article, I think it is true. My wife's MDX calls for 91 and we use mid-grade, never had a problem.
The car will probably run fine with gas that has less than 91 octane, but you will get less HP and MPG.moslof said:It looks we might need Acura to clarify this premium gas question. In the official USA "2004 Acura TSX" brochure (page 26 under "General Specifications"...Recommended Fuel), footnote 8 states that "Gasoline with an octane number lower than 91 may be used, with reduced performance."
I've never seen the owners manual....but if it says premium is required, there is definitely a discrepancy.
Not to mention pinging, retarded timing, and increased emissions (which may also put a strain on your catalytic converters). Honda engines are tuned to the edge of performance. Don't mess with that formula.sjlee said:The car will probably run fine with gas that has less than 91 octane, but you will get less HP and MPG.
OK, I think I will stop complaining now. Premium in north Mississippi is ~$1.80 and everyone is crying about it.spinstr said:Thanks for all the responses. Don't know where you all are at, but in Northern CA, premium gas is going for $2.35.
Agreed. Pinging on a high compression engine is not a good thing. Granted, the TSX engine is programmed to retard timing in the case of "bad gas" but you can't plan for every possibility. Take for example a really hot day...STC said:so you'd rather buy cheaper gas now and have your engine break later?
I live in Nor Cal too.