Skyactive: When did you start getting 40mpg? - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 12 (permalink) Old 11-24-2015, 04:57 PM Thread Starter
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Skyactive: When did you start getting 40mpg?

2015 3i Sport Hatchback automatic, 1k miles

last fillup was 90% hwy (va-nyc) and only got 33.5mpg

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post #2 of 12 (permalink) Old 11-24-2015, 05:58 PM
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Most important question:

What speed are you driving on the highway?
Because I can get better MPG than that if I do majority highway.
And that's because I'm not driving 80mph like the rest of the world.

I got upwards of 38+ while driving from Atlanta to Deep Creek Maryland on year.
Driving 60-65mph makes all of the difference.

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post #3 of 12 (permalink) Old 11-27-2015, 08:52 PM
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I have the 2013 Mazda3 Skyactiv hatchback, and my EPA rating is 39 MPG highway. As stated above, your speed is the biggest factor. If the cruising speed is about 65mph I can average 38-40 MPG, but at 80 mph it drops to about 34 MPG or so.

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post #4 of 12 (permalink) Old 11-29-2015, 10:14 AM Thread Starter
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Quote:
Originally Posted by Davids3 View Post
I have the 2013 Mazda3 Skyactiv hatchback, and my EPA rating is 39 MPG highway. As stated above, your speed is the biggest factor. If the cruising speed is about 65mph I can average 38-40 MPG, but at 80 mph it drops to about 34 MPG or so.
wow!
i had a 2005 Mazda3i automatic.
i got like 35mpg hwy driving 65mph and 34mpg driving 80mph.

Why the huge 20% drop when driving 15mph faster with the Skyactive engine?!
(or why a huge 20% fuel increase when driving 15mph slower?)

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post #5 of 12 (permalink) Old 11-29-2015, 10:21 AM
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Because cars aren't geared to go that fast for best MPG. They just aren't, it's just that Americans drive that fast because they think they'll save time.

Also, I guarantee your old car didn't get 34mpg at 80mph lol
I get below 30 when I'm anywhere near 80. But 60-65 I'm in the high 30s.

Lots more air and ground resistance.

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post #6 of 12 (permalink) Old 11-29-2015, 12:31 PM Thread Starter
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Originally Posted by XCNuse View Post
Because cars aren't geared to go that fast for best MPG. They just aren't, it's just that Americans drive that fast because they think they'll save time.

Also, I guarantee your old car didn't get 34mpg at 80mph lol
I get below 30 when I'm anywhere near 80. But 60-65 I'm in the high 30s.

Lots more air and ground resistance.
my 2005 3i did get 34mpg doing 78mph (cruise control).
# miles on tripometer divided by # of gallons at fill up. reset tripometer.
rinse/repeat.

did that at 200k miles till i got major transmission problems at 212k miles.
hm.. but i also had emission problems and engine problems (acceleration sucked) during that time as well.

so my car was basically trading power for better gas mileage during the last year of it's life?

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post #7 of 12 (permalink) Old 11-29-2015, 01:01 PM
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that or a different gas pump gave you less fuel than the previous pump, giving not the best results.

There are many many variables that go into getting MPG, but I have an extremely hard time believing you got 34 going 80mph, as the Skyactivs can barely do that... as you're discovering.

Sounds like a calculation error personally, whether it was your math at fault is likely not the reason, but things you can't insure.

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post #8 of 12 (permalink) Old 11-29-2015, 09:57 PM Thread Starter
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so i did another fillup of my 2015 3i.
ny back to va @78mph.
34mpg

next time will try at 73mph and will report back.

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post #9 of 12 (permalink) Old 11-29-2015, 10:45 PM
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Quote:
Originally Posted by silver3i View Post
wow!
i had a 2005 Mazda3i automatic.
i got like 35mpg hwy driving 65mph and 34mpg driving 80mph.

Why the huge 20% drop when driving 15mph faster with the Skyactive engine?!
(or why a huge 20% fuel increase when driving 15mph slower?)
Aerodynamic drag on a car scales approximately to the square of velocity. Aerodynamics in racing - F1technical.net

So when you're going 80mph vs 65mph, your aero drag goes up by about 50%. Your engine has to work that much harder to maintain speed.
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post #10 of 12 (permalink) Old 12-04-2015, 10:50 PM
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Damn, you guys are doing way better than me.

My 05 hatch averaged a 27.68 over its lifetime and my 09 has done 28.16 since I've had it.




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