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BRZ First-Gen (2012+) -- General Topics All discussions about the first-gen Subaru BRZ coupe |
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07-02-2012, 06:54 PM | #1 |
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Optimistic fuel economy?
Does anyone else have have a wildly optimistic avg. fuel economy reading on their trip computer? For my last two tanks I had an average reading of 37.8 and 36.5 mpg when I filled up (I reset it every time I fill up) but when I calculated it myself both tanks came to ~31-32 mpg. I still only have 900 miles on mine so I've been driving pretty easy. Maybe it'll get more accurate after the break-in period. And it's a manual tranny if anyone's wondering. I can't complain because these are still great numbers, but does anyone else have inaccurate readings?
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07-02-2012, 06:55 PM | #2 |
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Mine has been consistently +2 mpg
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07-02-2012, 06:55 PM | #3 | |
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Quote:
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07-02-2012, 07:53 PM | #4 |
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I've noticed this to a certain degree. It seems like the average reported by the car is usually between 0 and 1.5 MPG extra. I'm curious if they ignore idling or cheat in other ways :P.
On the flip side, trying to report instantaneous and average MPG without random spikes *and* being spot on would be difficult to implement. As engee mentioned, calculate it yourself. I just signed up at fuelly and it's really easy to use. I'd recommend it so long as you don't mind giving up data on your fuelling habits. |
07-02-2012, 08:35 PM | #5 |
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In my first tank of gas the trip computer was fairly accurate with < 1 MPG overestimate. For my second tank of gas the the trip computer overestimated by about 3 MPG. I had a lot more idling during my second tank because I spent quite a bit of time sitting around trying to get the GPS to work. So, maybe the trip computer is ignoring some of the idling time in its average MPG measurement.
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07-02-2012, 10:12 PM | #6 |
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depends on your mode of commute. I mainly do city driving so my avg is 25 mpg total. I have some freeway driving too hence the "higher" avg than the city estimate of 22mpg.
I'm also around 900 miles odo.
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07-02-2012, 10:20 PM | #7 |
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I've noticed on the wife's outback that if I hammer on it to get up to speed and then coast vs. a more conservative ramp up to speed it tricks the computer into showing a better average mpg.
Also - there is a program mode to adjust the mpg readout for the outback - to correct it being off - I imagine the procedure will be similar for the BRZ. |
07-03-2012, 01:12 PM | #8 |
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mine has been spot on so far. just did my 3rd fill up and i calculated 29.5. then checked the computer and it also showed 29.5.
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07-03-2012, 01:28 PM | #9 |
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3 fill ups......avg 34 mpg per tank
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07-03-2012, 01:54 PM | #10 |
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I do nearly all city, and im averaging about 24-25.
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07-03-2012, 03:39 PM | #11 |
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That's probably what it is then, since most cars with mpg displays usually go blank when you're idling at a complete stop, so it's not averaging moments of 0 mpg.
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07-03-2012, 05:09 PM | #12 |
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Mine said I would get 26.6 last tank and I got 30.5 but...I hadn't reset the Ave MPG since I bought the car so thats why. Not helpful I know but I was still pretty happy to see over 30mpg during engine break in (about 800 miles atm).
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07-03-2012, 05:53 PM | #13 |
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Last fill up said average = 28.8, actual by the math 28.7. :shrug:
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07-05-2012, 07:32 PM | #14 |
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The MPG on the trip computer is the average mileage you got since the car was first driven, unlike other Subaru's it's not tied to trip A or B that will reset when you clear your trip. You may have gotten 37MPG since you've had the car, but the last fill-up was under the average for the car.
With me, my average is 0.8MPG higher on the display than it actually is. EDIT: Unless there is a way to manually reset the average MPG? |
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