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Old 01-06-2014, 06:20 PM   #1 (permalink)
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Default Civic gets better mpg at 70mph than 10mph slower?

Recently came across the following link:

Fuel Efficiency & Speeding: The True Cost | Automatic Blog

which shows the following image:



Unfortunately, it doesn't say which Civic model it is.

I'd often suspected my I2 gets better fuel efficiency at 70mph than 60mph. Maybe it's not just my imagination?
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Old 01-06-2014, 07:40 PM   #2 (permalink)
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Maybe the auto civic has a crappy torque converter lockout?
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Old 01-06-2014, 10:17 PM   #3 (permalink)
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Yeah, we need mo on the civic.

The Insight runs out of gear ratio at about 60 in drive, so the car increases the rpms for mo speed. Before hand it has enough ratio to lug the engine if it chooses to, but it uses other variables. Once you run out of ratio the engine seels a good 80% load constantly where before hand its all over the place and not used til its full advantage.



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Old 01-07-2014, 03:50 AM   #4 (permalink)
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Measurement error. I suspect the 70mph result for the Civic is not repeatable.
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Old 01-07-2014, 08:31 AM   #5 (permalink)
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The link says it's aggregated data from 2000 hours driving for each car (8000 hours total) with 2009 to 2012 cars. That suggests a fairly large data set to me but perhaps they didn't actually spend much time at 60mph.

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Old 02-21-2014, 05:51 PM   #6 (permalink)
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The Prius data is wrong

Per a similar chart at priuschat, the Priuses' peak economy occurs at 25 miles/hour at -90 MPG.
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Old 02-21-2014, 07:11 PM   #7 (permalink)
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Apparently the data is collected from a variety of drivers using an OBD data logger. Depending upon how the data is collected and filtered, there could be a lot of confounding variables. Do the slower speeds correspond with transient acceleration and deceleration? Are the slower drivers driving in the city vs. highway?

I believe for most cars the peak in MPG occurs somewhere in the 40-50mph range for steady state, flat, no wind. I know some folks on here have worked it out exactly for the Insight.
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Old 02-21-2014, 10:04 PM   #8 (permalink)
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I recently got a phone app that tracks MPG vs speed via a Bluetooth OBD reader. It will take a while to build up a profile but I'll be interested to see what it will come out with for my I2.

For my typical driving, I drive at a steady 70mph far more often than 60mph. 60mpg is likely to be therefore in either acceleration or deceleration transition until I've put a lot of miles on the car. I wonder if my usage will show a similar pattern?

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Old 02-22-2014, 07:42 PM   #9 (permalink)
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Can you share more about this app and odb reader? I got an android and ios device plus an elm odb2 device at hand.

Quote:
Originally Posted by Uriel View Post
I recently got a phone app that tracks MPG vs speed via a Bluetooth OBD reader. It will take a while to build up a profile but I'll be interested to see what it will come out with for my I2.


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Old 02-28-2014, 11:06 AM   #10 (permalink)
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The bluetooth OBD device was just a cheap thing I picked up off Ebay. It works OK with Torque Pro and only cost about 15-20.

I recently started using a free Android app called Drively but it seems to cut off early in the journey if running in the background. I tend to use either Tomtom or Navigate 6 for traffic avoidance so whichever app I use needs to run in the background successfully. The app only launched recently so I'm in discussions with the developer about getting it to run consistently.

I'm also trying an app called OBD Mileage. This has a 30 day trial but will start a 1.99 per month subscription after that (I intend to cancel). So far it's running OK but I have too few miles logged for it to generate any meaningful statistics yet (it needs 200km before most of the graphs start working).

I understand that the graph in the OP was generated from aggregated data from several users of an app and OBD dongle combination called Automatic. This originally launched on iOS and is in beta for Android. It has some fairly good feedback on iOS and mainly just logs stuff automatically without the user needing to faff around with it. It's $99 though and only available in the USA.
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Last edited by Uriel; 02-28-2014 at 11:14 AM.
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