what grade of gas is best
Veteran
Joined: Dec 2005
Posts: 383
Likes: 0
From: Katy, TX
RE: what grade of gas is best
OK, lets open that can of worms again...
My 2006 Daytona R/T recommends 87 octane in the users manual. It will run fine on regular gas. If you add a Superchips programmer, or another brand, they have the option of tuning your engine for more power with a premium gas setting, either 91 or 93 octane depending on where you live (some people can only find 91 octane).
Things to consider:
Regular gas has a greater energy density, than premium gas. It potentially can get better mileage, and more power per gallon.
Premium gas has additives that help keep injectors clean, and octane boosters to allow the engine to develop more peak horsepower, if the programming takes advantage of it. If you run the stock program, regular gas may actually run your car to lower ET's.
In heavily congested areas like Houston, where I live, the gas has two different formulas for the same grade of gas during the year. From about October to April, we get normal gas, just like everyone else. But from April to October we get an "oxygenated blend" that reduces vaporization, and emissions on hot days. The net result is a gas with significantly lower energy density. If you ran a 1/4 mile with the winter blend, and all other environmental factors were the same (ie temperature & humidity), it would be 2/10 to 4/10 quicker than with the summer blend of gas. That sucks. When I go to the track I go with an empty tank and buy 2 or 3 gallons of 107 octane. The octane does not net any additional horsepower for my engine, but it does not have the oxygenating crap, which gives it a much higher power density, more zoom, zoom, zoom (sorry Mazda).
Overall geographic location, driving style, and engine programming should guide you in choosing the correct fuel grade, if your wallet doesn't....
My 2006 Daytona R/T recommends 87 octane in the users manual. It will run fine on regular gas. If you add a Superchips programmer, or another brand, they have the option of tuning your engine for more power with a premium gas setting, either 91 or 93 octane depending on where you live (some people can only find 91 octane).
Things to consider:
Regular gas has a greater energy density, than premium gas. It potentially can get better mileage, and more power per gallon.
Premium gas has additives that help keep injectors clean, and octane boosters to allow the engine to develop more peak horsepower, if the programming takes advantage of it. If you run the stock program, regular gas may actually run your car to lower ET's.
In heavily congested areas like Houston, where I live, the gas has two different formulas for the same grade of gas during the year. From about October to April, we get normal gas, just like everyone else. But from April to October we get an "oxygenated blend" that reduces vaporization, and emissions on hot days. The net result is a gas with significantly lower energy density. If you ran a 1/4 mile with the winter blend, and all other environmental factors were the same (ie temperature & humidity), it would be 2/10 to 4/10 quicker than with the summer blend of gas. That sucks. When I go to the track I go with an empty tank and buy 2 or 3 gallons of 107 octane. The octane does not net any additional horsepower for my engine, but it does not have the oxygenating crap, which gives it a much higher power density, more zoom, zoom, zoom (sorry Mazda).
Overall geographic location, driving style, and engine programming should guide you in choosing the correct fuel grade, if your wallet doesn't....
Captain
Joined: Apr 2006
Posts: 621
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RE: what grade of gas is best
Thats weird cause my R/T's manual says to run 89octane for best performance. If you are modified with a chip and the basic bolt-on's then I suggest to run 91 or better yet if you have it 93octane. If you have really crack your engine open and added a cam and performance heads then 93 is a most and if you throw in 100octane you'll probably see alittle more HP.
Record Breaker
Joined: May 2006
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From: Tucson
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Rookie
Joined: Aug 2007
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RE: what grade of gas is best
since i bought my R/T back in august i have used nothing but SUNOCO 93 octane in it
seems it gets a little less mpg then what i have read (10.4/city per evic) but have not had any problems so far
i DO plan on using the diablo along with a 180 thermostat when the weather gets nicer
persoanlly i dont think it can hurt the car using 93, just hurt the wallet
seems it gets a little less mpg then what i have read (10.4/city per evic) but have not had any problems so far
i DO plan on using the diablo along with a 180 thermostat when the weather gets nicer
persoanlly i dont think it can hurt the car using 93, just hurt the wallet
Registered User
Joined: Jul 2007
Posts: 8
Likes: 0
RE: what grade of gas is best
I havea 2006SE PP w/3.5 engine. I tried running 87 in it and got a check engine light, mis-fire on cyclinders. I switched back to 89/93 octane and the CLI went away. What's anyone opinion on what to use to get good gas mileage since the cost of gas is going up?