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Guest Message by DevFuse

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Register your Fusion Hybrid at the official Ford authorized registry here.


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Why your trip computer isn't accurate

EPA test is totally unrealist

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61 replies to this topic

#41 OFFLINE   tr7driver

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Posted 12 May 2014 - 08:49 AM

You do realize that if you pull the windshield wiper stalk toward you the car will wash the windshield for you.

:happy feet:

Wow! who would have thunk it?. 

 

Now if only the wipers could get the bug carcasses off as well as the nylon sponge squeegees do. 


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#42 OFFLINE   acdii

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Posted 12 May 2014 - 08:49 PM

That just bugs me.


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#43 OFFLINE   Texasota

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Posted 06 September 2014 - 05:27 PM

We just got back from a 1320 mile trip to the Michigan Upper Peninsula and our new FFH had ~250 miles on it when we began the trip. The trip computer reported 48.4 MPG for the entire trip and the hand calculation for the entire trip resulted in 45.9 MPG (2.5 MPG difference) which is approximately 5.4% inflation by the trip computer.

 

Will the MPG reported by the trip computer become more accurate over time?


Edited by Texasota, 06 September 2014 - 07:30 PM.

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#44 OFFLINE   GrySql

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Posted 06 September 2014 - 05:47 PM

We just got back from a 1320 mile trip to the Michigan Upper Peninsula and our new FFH had ~250 miles on it when we began the trip. The trip computer reported 48.4 MPG for the entire trip and the hand calculation for the entire trip resulted in 45.9 MPH (2.5 MPG difference) which is approximately 5.4% inflation by the trip computer.

 

Will the MPG reported by the trip computer become more accurate over time?

It might, but will never be as accurate as doing the math yourself.  Almost every post regarding the TC shows it as optimistic, and YMMV.

 

How was the ride?  Better than the Focus I hope.


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#45 OFFLINE   Texasota

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Posted 06 September 2014 - 07:29 PM

It might, but will never be as accurate as doing the math yourself.  Almost every post regarding the TC shows it as optimistic, and YMMV.

 

How was the ride?  Better than the Focus I hope.

 

I am very happy with it so far. A much nicer ride, much quieter, more room, and significantly better MPG than the Focus. So far I have not found anything that requires a visit to the service department. I think it might be a keeper.


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#46 OFFLINE   hybridbear

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Posted 06 September 2014 - 08:51 PM

We just got back from a 1320 mile trip to the Michigan Upper Peninsula and our new FFH had ~250 miles on it when we began the trip. The trip computer reported 48.4 MPG for the entire trip and the hand calculation for the entire trip resulted in 45.9 MPG (2.5 MPG difference) which is approximately 5.4% inflation by the trip computer.
 
Will the MPG reported by the trip computer become more accurate over time?

One thing we've found is that the odometer doesn't count enough miles. The odometer seems to be off by 2%. If you add 2 miles per hundred driven and then compare it to the actual gas used the results are very close. It seems that the car does slightly underreport gas used, but that seems to be very common. Most Prius owners find that their car is about 8-10% optimistic. That's what we found in our time with the Prius. That's much worse than in the FFH.

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#47 OFFLINE   Bob Cooke

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Posted 28 February 2015 - 03:19 PM

Optimistically confused. Just did my first fill up, so this would be the 2nd tank stealer filled first one. Now mind you it's been very cold here in Chicago.

I did remote start the car both morning and evening. So I know this is some of the culprit.

My numbers as recorded on the trip 344.7 158.8EV 42.6MPG low fuel light on @50. I put 10.907 Gals in. Now for the NEW MATH. If I assume correctly

344.7/10.907=31.609 this is nowhere near 42.6. 344.7-158.8EV miles =185.9 Actual gas miles driven which even worse 185.9/10.907=17.047MPG.

So can someone with deep knowledge of new math point me in the right direction? I traded in a 04 Buick Lesabre that was getting low 20's even with

remote starting every day so this is not exactly blowing smoke up my skirt. Nearly every trip I took showed nothing lower then 38 and no higher the 54.

Am I missing something? I love my new car but she needs to do better.


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#48 OFFLINE   corncobs

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Posted 28 February 2015 - 03:33 PM

I would try without remote start and check with next tank.

Over the last three month my tank avg. (calculated) has been 38.64 MPG. Considering how cold it has been not unhappy with that number.
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#49 OFFLINE   Cobra348

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Posted 28 February 2015 - 05:06 PM

In theory? or do you have documentation that says that.  I ask because I have been unable to find absolute documentation of that or verification of that from the dealership.  I think this is a huge issue and I would love to find some definitive info .....  :)

Logic dictates it ... if you remote start any vehicle, it is not moving at the time ... thus no TRIP computer registration.  However because the engine is running, MPG of any computed type is likely to drop by some portion the longer it sits idling.


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Larry - aka Cobra

 

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602A SE Luxury Package, Park Assist, Adaptive Cruise Control w/stop & go

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Steeda strut tower brace, Steeda rear sway bar, Steeda hood struts, Ford donut spare

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Winter rims/tires - 17" OEM rims with Goodyear UltraGrip WRT Ice


#50 OFFLINE   ptjones

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Posted 28 February 2015 - 06:49 PM

Bottom Line Remote Start and Heater Kill MPG's, in a month or two you will be surprised how much our MPG's improve. :)

 

Paul


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Current Record:  12/30/2014  902.2 mi.  63.8 mpg  14.13  gal. (Actual GPS:  922 mi.  68 mpg  13.5 gal.


#51 OFFLINE   Texasota

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Posted 28 February 2015 - 09:31 PM

My numbers as recorded on the trip 344.7 158.8EV 42.6MPG low fuel light on @50. I put 10.907 Gals in. Now for the NEW MATH. If I assume correctly

344.7/10.907=31.609 this is nowhere near 42.6. 344.7-158.8EV miles =185.9 Actual gas miles driven which even worse 185.9/10.907=17.047MPG.

EV miles are time spent running on the energy that has been stored in the HVB. It is true that the HVB is charged with regenerative braking (and regen when going down hill) but the overwhelming amount of the energy stored in the HVB is via charging from the ICE (i.e. burning gasoline).  And when you think about it, the energy captured during regenerative braking is coming from kinetic energy created by the ICE burning gasoline. Same is true when going downhill since the ICE expended energy by first going uphill (what goes up must come down).

 

Because of that It is not really a valid calculation of MPG to exclude EV miles.


Edited by Texasota, 28 February 2015 - 10:00 PM.

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#52 OFFLINE   mwr

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Posted 28 February 2015 - 10:29 PM

EV miles are time spent running on the energy that has been stored in the HVB. It is true that the HVB is charged with regenerative braking (and regen when going down hill) but the overwhelming amount of the energy stored in the HVB is via charging from the ICE (i.e. burning gasoline).  And when you think about it, the energy captured during regenerative braking is coming from kinetic energy created by the ICE burning gasoline. Same is true when going downhill since the ICE expended energy by first going uphill (what goes up must come down).

 

Because of that It is not really a valid calculation of MPG to exclude EV miles.

Very true. Also, a valid calculation of MPG should be accomplished with both fillups done when the HVB is at the same state of charge. AFAIK, we don't have a way to know the SOC exactly, only approximately by the vertical "thermometer". But over a full tank of gas (approx 11 gallons used and 500 miles driven more or less), approximately the same SOC should be fine.


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#53 OFFLINE   md13ffhguy

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Posted 01 March 2015 - 03:15 AM

over a full tank of gas (approx 11 gallons used and 500 miles driven more or less), approximately the same SOC should be fine.

I don't thank anyone could calculate this variance with any granularity! The difference in SOC has to be considered negligible.

FYI to Bob Cooke - 500 mile tanks are coming. Many of us will achieve 600 miles with ease, come summer.

Edited by md13ffhguy, 01 March 2015 - 03:20 AM.

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#54 OFFLINE   mwr

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Posted 01 March 2015 - 07:20 AM

I don't thank anyone could calculate this variance with any granularity! The difference in SOC has to be considered negligible.

I agree for full tank and distances. For short distances, the displayed MPG varies wildly because of differences in starting and ending SOC. If you were to fill up after a short distance, that calculated MPG would also vary depending on starting and ending SOC.


Edited by mwr, 01 March 2015 - 07:22 AM.

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#55 OFFLINE   Automate

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Posted 02 March 2015 - 04:09 PM

Has anyone used the Engineering Test Mode http://fordfusionhyb...ring-test-mode/and its instantaneous fuel level reading (displayed to a tenth of a percent) to determine when their fuel gauge gets to exactly 100% full?



#56 OFFLINE   hybridbear

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Posted 02 March 2015 - 04:58 PM

Has anyone used the Engineering Test Mode http://fordfusionhyb...ring-test-mode/and its instantaneous fuel level reading (displayed to a tenth of a percent) to determine when their fuel gauge gets to exactly 100% full?

The highest I've ever seen is 99.6 or 99.7%.


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#57 OFFLINE   Bob Cooke

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Posted 07 July 2015 - 12:02 PM

All righty gang,  this list is from the first fill up until now

here is my list of actual vs car mpg, difference and percent off

31.67 42.6 10.99 35%

43.47 48.8 5.33  12%

41.76 53.4 11.64 28%

48.36 56.7 8.34  17%

49.20 58.1 8.90  18%

53.30 60.3 7.00  13%

52.68 63.7 11.02 21%

58.56 65.8 7.24  12%

43.12 50.7 7.58  18%

35.30 44.4 9.10   26%

45.66 54.2 8.54  19%

45.49 51.8 6.31  14%

48.56 54.2 5.64  12%

40.13 49.7 9.57  24%

33.10 38.9 5.80  18%

overall car is off by 19%

 


Edited by Bob Cooke, 07 July 2015 - 12:10 PM.

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#58 OFFLINE   hybridbear

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Posted 07 July 2015 - 04:09 PM

All righty gang,  this list is from the first fill up until now

here is my list of actual vs car mpg, difference and percent off

31.67 42.6 10.99 35%

43.47 48.8 5.33  12%

41.76 53.4 11.64 28%

48.36 56.7 8.34  17%

49.20 58.1 8.90  18%

53.30 60.3 7.00  13%

52.68 63.7 11.02 21%

58.56 65.8 7.24  12%

43.12 50.7 7.58  18%

35.30 44.4 9.10   26%

45.66 54.2 8.54  19%

45.49 51.8 6.31  14%

48.56 54.2 5.64  12%

40.13 49.7 9.57  24%

33.10 38.9 5.80  18%

overall car is off by 19%

 

Do you use remote start? Any gas burned during remote start is not counted by the car and would cause these discrepancies.


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#59 OFFLINE   Sky14FFH

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Posted 22 December 2016 - 08:54 PM

I've been getting better than EPA (and do on all my cars) since I have owned it. Yes in the deep sub zeros of winter my MPG drops into the mid 30s but during the spring and most of the autumn I am in the low 50s and summer around 47 to 48.  Anytime you use your accessories it hurts your fuel economy.

 

 

Has anyone used the Engineering Test Mode http://fordfusionhyb...ring-test-mode/and its instantaneous fuel level reading (displayed to a tenth of a percent) to determine when their fuel gauge gets to exactly 100% full?

  That link is dead btw.  I'd like to try it though.


Edited by Sky14FFH, 22 December 2016 - 09:00 PM.


#60 OFFLINE   mwr

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Posted 23 December 2016 - 09:33 AM

  That link is dead btw.  I'd like to try it though.

Here you go. http://fordfusionhyb...ealer-test-mode


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