which company gas works better for Mazda Cx5

[CX-5um]

Most of the posts in this thread give me the feeling that many of you didn't pay much attention in middle school science class when they taught the scientific method.

How much of a difference are you guys expecting to see between different brands of gas?

Take Unobtanium for example...

His mileage differs by over 4% from tank to tank for no reason at all. It's impossible for him to measure the ~3% improvement he will get from ethanol free gas by running a single tank.
Even 10 tanks don't prove anything at all unless he can accurately compensate for factors such as temperature, seasonal fuel blends, wind ect..
It's a proven, easily verifiable fact that ethanol has less energy per volume than pure gasoline, so whatever his little experiment "proves" doesn't mean anything at all.

Not sure if this helps but I buy gas on these factors:

Cost: There's a Shell near me selling 87 octane for say 2.35/gallon but another just a bit further for 2.13/gallon.

Detergents: Chevron has Techron. Shell has its stuff. Cheap gas may not have such additives but do carry the federal minimums. I'm willing to pay an extra few cents for the "good stuff". After all how many of us purchased a bottle of Techron?

Location: If a gas station is a known chick locale, near a starbucks, or has a Duncan Donuts inside hey those are pluses!!

Re-Fuel frequency: I often hear its good to get gas from busy stations since they're constantly stocking up on new fuel. Hence you find me getting cheaper gas from QT. Its still top tier. (tip:Circle K gas is from Shell.) These two places are always busy.


Edit: Also I try to get gas from newer stations with newer gas station fuel pumps/tanks.

 

[Unobtanium]

Where did you find zero ethanol gas? I can't find anything here in Houston.

Dunno about Houston, but in my area it's all over the place. It just costs like $2.37/gal for the 87 octane. So this better get me 20% more mileage. That's all I'm saying...

 

[Unobtanium]

Most of the posts in this thread give me the feeling that many of you didn't pay much attention in middle school science class when they taught the scientific method.

How much of a difference are you guys expecting to see between different brands of gas?

Take Unobtanium for example...

His mileage differs by over 4% from tank to tank for no reason at all. It's impossible for him to measure the ~3% improvement he will get from ethanol free gas by running a single tank.
Even 10 tanks don't prove anything at all unless he can accurately compensate for factors such as temperature, seasonal fuel blends, wind ect..
It's a proven, easily verifiable fact that ethanol has less energy per volume than pure gasoline, so whatever his little experiment "proves" doesn't mean anything at all.

I paid attention in economics class in college, though, and I know that a 20% increase in cost damn well better give me a 20% increase in utility, and the only utility that is quantifiable for this vehicle right now, would be a 20% increase in fuel mileage, so while I know that ethanol free gas is only worth 3% "by the book", I want to verify the book for myself. If indeed it comes in at anything less than 20%, it's a waste of my money. That is all the functional information I need to make a decision for the future regarding utility and cost/benefit of that product.

Further, fuel mileage due to "seasonal blends" is also identical to within my margin of error. 22.5-23.5 or so. Doesn't matter if it's 10*F in December, or 100* in June. Same mileage.

 

[freys]

I never took any classes or any of that smart folks thing but I did stay in a holiday inn a few times when i was racing. You guys aren't going to be able to prove a darn thing one way or the other going by MPG. A tank from winter gas to summer gas is going to change that more than anything else along with the warmer temps. Now days with all this injection and computer stuff constantly changing the fuel air mixture it just doesn't matter. Running above 87 isn't going to do a darn thing either for our cars that you can notice depending on altitude. It all comes down to how heavy you are on the skinny. The different additives are just for prolonged life. If you plan to sell before 70/80k just run the cheap s*** longevity doesn't matter.

 

[Rarebit]

When anyone posts their gas mileage they should also post the average speed for that tank. There's an important relationship between the two.

 

[Unobtanium]

When anyone posts their gas mileage they should also post the average speed for that tank. There's an important relationship between the two.

33mph +-1 is what my mileage is calculated off of. The above graph goes a long way toward exposing the BS about "aerodynamics hurt our CX-5's so much more than any other SUV or vehicle on the planet", though...

 

[Rarebit]

33mph +-1 is what my mileage is calculated off of. The above graph goes a long way toward exposing the BS about "aerodynamics hurt our CX-5's so much more than any other SUV or vehicle on the planet", though...

Mine is 24.8 mph vehicle lifetime avg. and 23.76 mpg.