Horrible gas mileage in brand new CX-5

[N7turbo]

There are too many variables between two people in different locations to make that comparison. Overall, I don't think wheel weight has a big effect on economy. Personally, I dropped 6.5 lb per corner and I don't believe I gained any fuel economy from it. The fuel economy differences between different tires is well known though.

 

[BoomerZoomr]

My 2025 CX-5 2.5L turbo is going through its first tank of gasoline. I have 36% gas remaining in the tank having traveled 181 miles of mostly highway driving. Not very good mileage, but the thing has to break in (I am hoping).

 

[BoomerZoomr]

Today I refilled my 2025 turbo CX-5 fuel tank with 93 octane. The previous tank was 87 octane the car salesman had put in. The computer indicated that my mileage on that first tank was 19.8, but the actual mileage by tank top-off was 20.8
Mostly highway driving, but around town I wasn’t babying it.

 

[leeharvey418]

Don’t even try paying attention to the mileage indication on the instrument cluster. It should come with a disclaimer saying “for estimation and entertainment purposes only”.

 

[Mazdiod2]

Today I refilled my 2025 turbo CX-5 fuel tank with 93 octane. The previous tank was 87 octane the car salesman had put in. The computer indicated that my mileage on that first tank was 19.8, but the actual mileage by tank top-off was 20.8
Mostly highway driving, but around town I wasn’t babying it.

I always get better gas mileage with the no-ethanol premium.

 

[RedBaron]

I always get better gas mileage with the no-ethanol premium.

Of course you do. But is it better 'enough' to pay for the increased cost per gallon?

 

[Mazdiod2]

I've never tried to calculate that.

 

[sm1ke]

I've never tried to calculate that.

I have, and I don't think its worth it for the mileage increase alone. With the 2.5T, it's worth it if you can take advantage of the other benefits it provides, like the increased performance at higher RPMs or if you have something like a JB4 piggyback tuner. With the N/A engine I would just stick to 87 from top tier suppliers.

 

[N7turbo]

I have, and I don't think its worth it for the mileage increase alone. With the 2.5T, it's worth it if you can take advantage of the other benefits it provides, like the increased performance at higher RPMs or if you have something like a JB4 piggyback tuner. With the N/A engine I would just stick to 87 from top tier suppliers.

Here we have options that include the same octane with and without ethanol. So there is no performance benefit, only your choice whether to take the cost savings per gallon of E10/15 or the increased range of the non-ethanol gas.

 

[Odrapnew]

Gas station by me had 91 No-Eth for same price as their 89 E10.
Their 91 E10 is more expensive than 91 No-Eth. Makes no sense.
I thought it was a mistake last summer, but it's been that way for over a year.
Another station near me has 91 No-eth for something like $1 more than 91 E10, which is what I expect.

Today I refilled my 2025 turbo CX-5 fuel tank with 93 octane. The previous tank was 87 octane the car salesman had put in. The computer indicated that my mileage on that first tank was 19.8, but the actual mileage by tank top-off was 20.8
Mostly highway driving, but around town I wasn’t babying it.

That first tank likely had a lot of idling, city driving, 'heavy foot' driving.
Don't pay attention to that one.
As you put more miles on it, MPG will increase as things break in and loosen up.
Check back in about 5000 miles.