HIGHWAY MPG thread for both 2.0 and 2.5 w/poll!! - Page 2 - 2004 to 2016 Mazda 3 Forum and Mazdaspeed 3 Forums
View Poll Results: Highway MPG 2.0/2.5L
2.0 <34 Highway MPG 70 8.43%
2.0 34-36 Highway MPG 80 9.64%
2.0 37-39 Highway MPG 126 15.18%
2.0 40-42 Highway MPG 130 15.66%
2.0 43+ Highway MPG 70 8.43%
2.5 <30 Highway MPG 46 5.54%
2.5 30-32 Highway MPG 85 10.24%
2.5 33-35 Highway MPG 113 13.61%
2.5 36-38 Highway MPG 73 8.80%
2.5 39+ Highway MPG 37 4.46%
Voters: 830. You may not vote on this poll

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post #11 of 387 (permalink) Old 09-03-2014, 09:27 AM
SlyActiv
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My display says the averages are 39 MPG and 34 MPH. So I assume that my highway MPG is up in the low 40's. My first fill up hit a 38 average on a tank that included a 200 mile road trip. My second fill up was a 36 average that was all my typical commute.

We have had a wonderful summer this year in MD and so I've not used my AC as much as usual. I think that makes a big difference in the little 2.0. I know I can feel it in the drag when engine braking. I believe the EPA runs the AC during their test cycle whenever a car is equipped with it. May not be so noticeable on the stronger 2.5.

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post #12 of 387 (permalink) Old 09-03-2014, 11:28 AM
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Hard to be very accurate. Everyone's driving conditions are different (hills, traffic, etc.) I think for highway MPG, also cruising at 60mph vs. 80mph can make huge difference as well. My experience with most other cars is cruising around 50mph is pretty much ideal as that get you into top gear at very low RPM.
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post #13 of 387 (permalink) Old 09-03-2014, 11:44 AM
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Quote:
Originally Posted by smoothmoose View Post
Hard to be very accurate. Everyone's driving conditions are different (hills, traffic, etc.) I think for highway MPG, also cruising at 60mph vs. 80mph can make huge difference as well. My experience with most other cars is cruising around 50mph is pretty much ideal as that get you into top gear at very low RPM.
It also gets you honked at by me.
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post #14 of 387 (permalink) Old 09-03-2014, 12:08 PM Thread Starter
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Quote:
Originally Posted by onimazda View Post
I've been averaging between 36-38mpg, according to the pump. I think that you will find that manual transmission will probably be 5-10% higher than automatics, despite the slightly lower EPA estimates.

Ugh I voted wrong. On the highway, I've probably been getting 43mpg+. Its very difficult to tell highway MPG considering that the cars calculations can be optimistic by as much as 3-4mpg.
I've actually found the cars calculations to be low by 2-3mpg consistently in the first 1500 miles i've owned the car. It will often say 29 or 30mpg average for the tank, but when i fill up and do the math its always 32-34mpg.
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post #15 of 387 (permalink) Old 09-03-2014, 04:46 PM
smoothmoose
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Quote:
Originally Posted by TheBobmanNH View Post
It also gets you honked at by me.
Nah...50 mph average is on the sideroads...on the freeways and interstates, I'm definitely going between 65-80+ if i can.
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post #16 of 387 (permalink) Old 09-03-2014, 04:49 PM
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Quote:
Originally Posted by falcompsx View Post
I've actually found the cars calculations to be low by 2-3mpg consistently in the first 1500 miles i've owned the car. It will often say 29 or 30mpg average for the tank, but when i fill up and do the math its always 32-34mpg.
I find the trip computers calculations to be very accurate thus far. If you top off at the pump too much that may impact you calculations quite a bit, albeit in the other direction.

Most annoying thing is that even if I run the fuel down to the last bar, I barely get 10 gallons to fill. I know it's been discussed before, but to fill based on the 1/4 tank rating that Mazda recommends, that's only about 8 galloons out of 13.2 tank.
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post #17 of 387 (permalink) Old 09-03-2014, 05:06 PM
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With these kinds of mpg threads, it's hard to give a single answer. There are so many things that can affect your mpg numbers. My highway mpg can range from 25-39mpg depending on terrain and distance and speed. And the trip computer is indeed very accurate as it's pretty close to what I get whenever I fill up.


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post #18 of 387 (permalink) Old 09-03-2014, 05:22 PM
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2.0 MT - getting right at 40 MPG hwy with pretty much every long hwy trip. That is a calculated figure. I never use the avg mpg screen in the info guage. I just divide the miles by the gas and it's been consistently right at 40. I'm a happy camper at this point.

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post #19 of 387 (permalink) Old 09-03-2014, 06:01 PM Thread Starter
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Quote:
Originally Posted by smoothmoose View Post
I find the trip computers calculations to be very accurate thus far. If you top off at the pump too much that may impact you calculations quite a bit, albeit in the other direction.

Most annoying thing is that even if I run the fuel down to the last bar, I barely get 10 gallons to fill. I know it's been discussed before, but to fill based on the 1/4 tank rating that Mazda recommends, that's only about 8 galloons out of 13.2 tank.
sometimes i wonder if we actually do have a 13.2 gallon tank... I'd hate to go down to zero to empty knowing that I *should* have 2.2 gallons remaining and run dry 5 miles later. i've run it down to ~3 miles and it only took 10.9 gallons to fill up.
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post #20 of 387 (permalink) Old 09-03-2014, 06:01 PM
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Remember that EPA highway is measured at 60mph. In a state where some of the roads I drive regularly are 80 MPH, and 85 MPH roads exist, I have to take that into account.

Ambient temps (and A/C use) and Summer vs. Winter blend all make noticeable differences but if I've got an actual stretch around 60-65 mph, I can absolutely achieve 36-36.5 MPG. Short bursts I can do slightly better but that's not realistic. Cruising at speeds up to 70-75, maybe 32-35 MPG for realistic highway use, but 80-85 will hurt mileage significantly.

My city cycle is typically 24.5-27, but never less than 23-24 MPG. For city cycles that include lots of freeway cruising, I can get 28-31 or so.

Touring S, 2.5l
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