What kind of gas should I use in my mazda 6 to make it run great and also should I use fuel additives ?

I do race my mazda 6s a lot every weekend and of course when their is a competion present

 

The engine for the 6s (stock) is designed to run off 83 octane (regular unleaded), higher octanes, as i understand it, will actually be less eficient as they have a higher flash point. Now, if you race it and have modded the engine, the recomended octane rating will change. Hope this helps.

-Cameron Keffer

 

I use 83 and only from Sunoco, i dont use Sheetz fule, if you are familiar with sheetz u know what i mean. If i dont use Sunoco i find a Exxon.And NEVER fill up when the truck is there filling the gas wells.

 

i use 89.......by the statment above maybe i should just go back to 87...........what u think?

 

Just stick to regular fuel. Unless you're experiencing engine knock, you're just wasting money on high octane gas.

 

Why not?

 

When they fill the tanks at the station it stirs up a ton of sediment in the tank which you will then pump into your car. Not so much a problem if you've got a fresh fuel filter in your car, but it will definitely accelerate the filter clogging up.

87 Octane is the recommended fuel for Mazda6/3 except for the Speed models which require Premium. Running higher octane than specified in the manual only wastes your money as the fuel system mapping is calibrated for 87, and the car will deliver the fuel/spark in the air/fuel ratios as determined by 87 Octane.

 

If I remember right, it's because it stirrs up the contents of the tank and can lead to getting bad gas or crud in your tank. Now, don't quote me on that, but I seem to remember that being the reason I heard given for never filling up when the truck is filling up the wells. Wish I could give a more defenite answer.

-Cameron Keffer

 

Did you guys plan to answer that at the exact same time? Nice work!

I had actually heard that before as well, I was just wondering if there was some other explanation. Seems to make sense to me.

 

[:@]dammit, I've been using the 89. Better bump it down to 87. Thank you.