Mazda5 real-world Mileage numbers

[rweatherford]

Using E85 for $2.70 in MA... 5500 mileage...35 MPG highway 29 MPG city with a lot of speed.

MaZdA5 2008 sport

That is very high. How much E85 was in your tank vs regular fuel. Normally I would not recommend running over an E30. I would think that running pure E85 would cause ECM problems and lower mileage than that.

I guess I'm impressed and concerned at the same time.

 

[rweatherford]

my best mileage so far in 20,000 miles of driving was this week: 28 mpg, mostly highway, various rates of speed, sometimes as high as 80 mph, usually around 70 mph.

That sounds about right for highway and that speed.

 

[rhemz81]

That is very high. How much E85 was in your tank vs regular fuel. Normally I would not recommend running over an E30. I would think that running pure E85 would cause ECM problems and lower mileage than that.

I guess I'm impressed and concerned at the same time.

What is ECM? It is 70% ethanol and 30% reg. fuel. That is what I always see everytime I went to E85 station. Actually the Mazda manual required only 10% ethanol.

 

[jeebusm3]

What is ECM? It is 70% ethanol and 30% reg. fuel. That is what I always see everytime I went to E85 station. Actually the Mazda manual required only 10% ethanol.

No, you have it backwards. The Mazda manual requires NO MORE than 10% ethanol. Our cars are not designed for e85. e85 requires injectors that are capable of pushing more fuel as e85 does not have the same amount of energy as regular gasoline and more of it is required during combustion. Cars can run e85 have injectors that support this, fuel lines that support this, and the engine control systems are designed to increase fuel rates to accomplish this.

Cars can generally run more timing and boosted cars can run more boost pressure when running e85 because it has an effective octane rating that is closer to race fuels than street fuels. HOWEVER, more fuel is used and you will get worse mileage running e85 in ANYTHING, whether is is designed for it or not.

I would not recommend running e85 in a Mazda5 AT ALL. I know people that run e85 in cars that aren't certified for it, but they have tuned the cars and modified them so they can run it. They sit there with laptops watching data to make sure it's ok. It's not something you just put into a normal car.

 

[rweatherford]

I would not recommend running e85 in a Mazda5 AT ALL. I know people that run e85 in cars that aren't certified for it, but they have tuned the cars and modified them so they can run it. They sit there with laptops watching data to make sure it's ok. It's not something you just put into a normal car.

Agreed!

 

[rhemz81]

No, you have it backwards. The Mazda manual requires NO MORE than 10% ethanol. Our cars are not designed for e85. e85 requires injectors that are capable of pushing more fuel as e85 does not have the same amount of energy as regular gasoline and more of it is required during combustion. Cars can run e85 have injectors that support this, fuel lines that support this, and the engine control systems are designed to increase fuel rates to accomplish this.

Cars can generally run more timing and boosted cars can run more boost pressure when running e85 because it has an effective octane rating that is closer to race fuels than street fuels. HOWEVER, more fuel is used and you will get worse mileage running e85 in ANYTHING, whether is is designed for it or not.

I would not recommend running e85 in a Mazda5 AT ALL. I know people that run e85 in cars that aren't certified for it, but they have tuned the cars and modified them so they can run it. They sit there with laptops watching data to make sure it's ok. It's not something you just put into a normal car.

Thanks for the info. Im now so worried, only faith I had that's nothing worst comes out in what I did.

 

[rweatherford]

Thanks for the info. Im now so worried, only faith I had that's nothing worst comes out in what I did.

If your fuel tank is not full just go add some regular fuel until it is full. This will help dillute the E85 and bring the percentage of ethanol down some. Eventually you will get the ratios back down to a more normal level.

Just the fact that no check engine lights have come on intrigue me.

 

[jeebusm3]

Thanks for the info. Im now so worried, only faith I had that's nothing worst comes out in what I did.

there is a possibility you did no real harm. Your injector duty cycle certainly went up for a while but if you don't have any check engine lights on, you probably didn't end up misfiring or anything of the sort.

Remember, it's not THAT hard to convert a car for e85, just not advisable unless the conversion has been made.

 

[coolmazda5]

Just a quick update...

2006 Mazda5: 70 city / 30 highway: 22.60MPG (US)
2008 Mazda5: Purely city: 22.92MPG (US)

 

[jeebusm3]

Just a quick update...

2006 Mazda5: 70 city / 30 highway: 22.60MPG (US)
2008 Mazda5: Purely city: 22.92MPG (US)

yeah our '08 tends to pull 23-24 pure city.

 

[steph1693]

Here are my mileage numbers:

Mazda 5 GT 5sp AT 17'' weel with AC

465 Km 51.033 L 10.97l/100km 21.4 mpg
436 Km 48.258 L 11.07l/100km 21.25 mpg
479 Km 51.983 L 10.85l/100km 21.67 mpg

I'm now 4650km with the car and hope the mileage will be better in the future, i'm a normal driver no fast acceleration. I have to say i'm a little bit disapointed but love the car very much. Mazda says you do 9.6/100 (24.5 mpg)City and 7.1l/100km (33.12) highway, i think that's bs. My numbers are very far from Mazda. My first oil change will be in 4-6 weeks, i will put synthetic oil and see ih this would help. I honestly don't know how you can get 25-30 mpg, i am driving normaly and do 75% higway at around 110 km/h(65 mph) no kickdown and i have a 5 speed transmission instead of 4 speed like previous years.

 

[jeebusm3]

Here are my mileage numbers:

Mazda 5 GT 5sp AT 17'' weel with AC

465 Km 51.033 L 10.97l/100km 21.4 mpg
436 Km 48.258 L 11.07l/100km 21.25 mpg
479 Km 51.983 L 10.85l/100km 21.67 mpg

I'm now 4650km with the car and hope the mileage will be better in the future, i'm a normal driver no fast acceleration. I have to say i'm a little bit disapointed but love the car very much. Mazda says you do 9.6/100 (24.5 mpg)City and 7.1l/100km (33.12) highway, i think that's bs. My numbers are very far from Mazda. My first oil change will be in 4-6 weeks, i will put synthetic oil and see ih this would help. I honestly don't know how you can get 25-30 mpg, i am driving normaly and do 75% higway at around 110 km/h(65 mph) no kickdown and i have a 5 speed transmission instead of 4 speed like previous years.

every car is a little bit different. Some just never get great mileage. Others get mileage that is absurdly high. Most get somewhere in the EPA range. Our 2008 Mazda5 gets better mileage than our 2004 Mazda3 ever did. They have the same 2.3. Both were manual transmission. The Mazda3 was much lighter and by all logic it should have gotten better mileage than this Mazda5, but it did not.

 

[rhemz81]

there is a possibility you did no real harm. Your injector duty cycle certainly went up for a while but if you don't have any check engine lights on, you probably didn't end up misfiring or anything of the sort.

Remember, it's not THAT hard to convert a car for e85, just not advisable unless the conversion has been made.

It is not starting in the morning, I need to start it for 2 to 3 times before engine start. Is it because I try to convert and used e85?

 

[jeebusm3]

It is not starting in the morning, I need to start it for 2 to 3 times before engine start. Is it because I try to convert and used e85?

probably. but you should take it in to find out. I wouldn't mention you used e85 to the dealer as it will likely void your warranty.

 

[szwakon]

Using E85 for $2.70 in MA... 5500 mileage...35 MPG highway 29 MPG city with a lot of speed.

MaZdA5 2008 sport

That's strange. Usually mileage on E85 is worse than regular gasoline.

 

[eilros25]

I just took a 1143 mile trip on I-80 from Indiana through central Pennsylvania and averaged 30.11 MPG driving 70-75. The temp was in the mid-80s and I had the AC set at 70 for the whole trip.

 

[AO928]

I took a nice long trip with the whole fam damily and got 29MPG driving about 77.

 

[BlueThunder]

Here are my mileage numbers:

Mazda 5 GT 5sp AT 17'' weel with AC

465 Km 51.033 L 10.97l/100km 21.4 mpg
436 Km 48.258 L 11.07l/100km 21.25 mpg
479 Km 51.983 L 10.85l/100km 21.67 mpg

I'm now 4650km with the car and hope the mileage will be better in the future, i'm a normal driver no fast acceleration. I have to say i'm a little bit disapointed but love the car very much. Mazda says you do 9.6/100 (24.5 mpg)City and 7.1l/100km (33.12) highway, i think that's bs. My numbers are very far from Mazda. My first oil change will be in 4-6 weeks, i will put synthetic oil and see ih this would help. I honestly don't know how you can get 25-30 mpg, i am driving normaly and do 75% higway at around 110 km/h(65 mph) no kickdown and i have a 5 speed transmission instead of 4 speed like previous years.

Hey quelqu'un du Qubec! Passe nous voir au clubmazdaquebec.com .


I just got my best MPG ever on the 5 since february. On a 570 km trip, we fulled up with 42.1 L. That gives an amazing 7.4 L/100 (Mazda specs for highway is 7.2L/100). It 38 MPG (Canada) or 31.75 US MPG. Therefore, there was a price to pay and I was the fun-to-drive factor. I was driving about 60 miles/hour al the way. Boring but satisfying at the same time.

2008 GS 5 AT

 

[straw10]

Just finished my first tank at 27.3mpg That is with the A/C on full time and varying the speeds as the manual suggests.

 

[canessa]

Believe it or not....

My 08 touring AT usually consumes 23-25 MPG with K&N air filter. However, I've just given MindBlower Performance Stage 6 Chip a shot, and woala .... I have been getting 28-30 MPG. All measurements are taking based on my 80hwy/20city commute. Bottom line is, beleive it or not, MindBlower performance stage6 really works on our car.