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Old 04-30-2012, 08:54 AM   #851
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Quote:
Originally Posted by raptor1956 View Post
Here's the data:

75mph (west bound) = 32.87mpg
75mph (east bound) = 32.93

65mph (west bound) = 37.65
65mph (east bound) = 41.51

55mph (west bound) = 47.09
55mph (east bound) = 47.60

40mph (west bound) = 52.46
40mph (east bound) = 59.85

30mph (west bound) = 64.26
30mph (east bound) = 67.37
Those low speed numbers seem way too high. Everything I've seen on the internet (which frankly isn't much) suggests economy peaks in the 50-60 mph range.



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Old 04-30-2012, 10:01 AM   #852
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Quote:
Originally Posted by kam327 View Post

That graph looks pretty close to the '12 Focus (percentage wise) as the drop-off past 60 is in fact that steep.

I did a 150 mile (each way) trip into Michigan and it illustrated two obvious factors in MPG-- "speed" and "weather". I had light traffic and was on the same BP tank of gas so those were the only 2 significant variables.

The weather Sat morning was in the 40's and pretty windy. On the interstate at 73MPH (first 100 miles), it was pretty steady at 34MPG. Once I got off the interstate onto the two lane, I reset the MPG meter and set speed at 57 MPH and was getting over 39.5 MPG for the last 50 miles.

Now, on the way back Sunday afternoon, the weather was in the 60's and virtually NO wind. Beautiful day. There is very little elevation change in SE MI, so the route back is a pretty much a mirror. The two lane section saw me getting 42.5MPG (for the 50 miles at 57 MPH). Back at 73 MPH, I was getting 38.2 MPG.

I already knew the speed was a huge factor but it was surprising that the weather made a (roughly) 10% difference.
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Old 04-30-2012, 03:51 PM   #853
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Quote:
Originally Posted by kam327 View Post
Those low speed numbers seem way too high. Everything I've seen on the internet (which frankly isn't much) suggests economy peaks in the 50-60 mph range.



Yeah, that was my first thought as well. As I indicated in my prior I suspect there maybe a calibration issue with the MPG calculation within the ECM that under-reports fuel usage at the lower flow values. Interestingly, at 75mph the mpg number in the 32-33mpg range are right on with my manual tank fill calculations so I suspect that as the flow decreases from there the fuel flow readings are reported lower and the lower the flow the greater the percent error.

The only way to confirm this, of course, is actually drive for a set distance at that speed and do a direct measure of the fuel usage. There's no practical way to do that by driving a full tank full or two at 30mph and what you really need is the kind of gear the pros use -- a separate gas tank comprised of a graduated cylinder holding something like a half gallon. You'd first fill it to the line, then drive the test, then refill and measure how much you put in.


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Old 05-01-2012, 08:21 PM   #854
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Originally Posted by ericrz View Post
First tank of gas on my SEL hatchback (AT) was 21.5mpg -- calculated by hand, and it matched what the trip computer said.

100% city driving, stop and go traffic. Still, I'm not happy and I hope it improves with time. Just under 500 miles on the car now. I'm a moderate driver, I've done a couple of aggressive starts from green but mostly standard city driving.

Not impressed so far, but I'll be patient and hope that things will improve.
mine is similar. local 22-23 mpg. 50/50 - 27mpg. under 400 miles.
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Old 05-01-2012, 08:36 PM   #855
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mine is similar. local 22-23 mpg. 50/50 - 27mpg. under 400 miles.
Be patient. It gets a lot better around 1000-1500 miles.
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Old 05-01-2012, 09:21 PM   #856
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My 4th fill-up - 10.101 gallons with a trip meter of 308.6 miles, main odometer at 1023 miles... these values have been more-or-less consistent since the very beginning (0 trip, 5 odometer )

I do far more local traffic than highway... (60/40, possibly 70/30)

My 09 Focus would NEVER get anything approaching 30MPG at this time of year. (27 being more normal).

It's nice to have the onboard computer underestimate things...
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Old 05-01-2012, 09:26 PM   #857
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Quote:
Originally Posted by raptor1956 View Post
Yeah, that was my first thought as well. As I indicated in my prior I suspect there maybe a calibration issue with the MPG calculation within the ECM that under-reports fuel usage at the lower flow values. Interestingly, at 75mph the mpg number in the 32-33mpg range are right on with my manual tank fill calculations so I suspect that as the flow decreases from there the fuel flow readings are reported lower and the lower the flow the greater the percent error.
I finally got to take my first 100-mile highway trip after 3 mos. of ownership () and at a fairly steady 70-75 the computer said around 37. That seems high based on what you and others have said, but I won't be able to confirm with hand calcs since it was only over 1/4 of a tank.

Quote:
Originally Posted by raptor1956 View Post
The only way to confirm this, of course, is actually drive for a set distance at that speed and do a direct measure of the fuel usage. There's no practical way to do that by driving a full tank full or two at 30mph and what you really need is the kind of gear the pros use -- a separate gas tank comprised of a graduated cylinder holding something like a half gallon. You'd first fill it to the line, then drive the test, then refill and measure how much you put in. Brian
An easier way, if you REALLY wanted to get into it, would be to weigh the car before and after each test to measure fuel used. That's how Popular Mechanics did it.
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Old 05-01-2012, 10:44 PM   #858
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Quote:
Originally Posted by kam327 View Post
I finally got to take my first 100-mile highway trip after 3 mos. of ownership () and at a fairly steady 70-75 the computer said around 37. That seems high based on what you and others have said, but I won't be able to confirm with hand calcs since it was only over 1/4 of a tank.



An easier way, if you REALLY wanted to get into it, would be to weigh the car before and after each test to measure fuel used. That's how Popular Mechanics did it.
That might be easier but the error would be too high! Your not going to be much better than within 5 pounds with a car weight and even if you could get to one pound the error, particularly if the drive at 30mph is only 15 miles or so where the weight of fuel consumed could be as little as 2 pounds or less. So, with a 1 pound error and 2 pounds of fuel consumed the calculated mpg could be anywhere from 30mpg-90mpg.


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Old 05-01-2012, 11:10 PM   #859
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Just went through the first tank of gas, and got 335 miles. This is doing 75-80mph at 120 miles round trip each day. The mpg meter on the dash said 30.5 mpg.

Filled up with 10.9 gallons. Divided into 335 miles, that's 30.7 mpg, so seems pretty accurate.

I'd like to see more in the range of 35mpg, but I realize at highways speeds of 75-80 that's not going to happen. But that's still 100 more miles to a tankful than my SVTF got, so I am pretty happy with it.

We'll see what happens when the car breaks in after a few thousand miles and also after I switch to Amsoil full synthetic.
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Old 05-01-2012, 11:25 PM   #860
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32 mpg on 40K 2012 SE Auto Sport Package
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