Empower - Is MPG breakdown calculation possible?

[keybman]

The following sounds like an Algebra problem, but here it comes anyway…

 

Using the Empower mode when a trip is completed, the display shows total trip miles, EV miles and Regen miles. Is there a direct correlation to MPG numbers that can be derived from this information? For instance, this morning I traveled 17.6 mi (11.8 EV, 1.8 Regen). If I am reading this correctly, that means that I traveled 4.0 miles on ICE alone. Can I determine what MPG the ICE is producing from these numbers? (The other part of the equation is total MPG for the trip was 55.8)

[lmp180psu]

I think it is as simple as taking the calculated ICE miles and dividing in the gallons used on the trip summary to get ICE mpg. Maybe that is too simple but it makes sense to me.

[tombarker13ffh]

The ICE does not always work alone on non-EV miles. The eCVT combines the electric and gas drive systems at infinitely variable ratios. Depending on your state of charge, the gas engine will work extra hard to charge the HV battery or it'll run easy with some electric assist or it'll run hard during heavy acceleration. I thought there was a way to inhibit EV mode, but it'd be very difficult to calculate accurate ICE mpg for this reason. And the car will give you a trip summary when you turn the key off no matter what display mode you're using.

Edited April 17, 2013 by tombarker13ffh

[keybman]

That makes sense to me. I had tried as Imp has suggested to calculate the ICE mileage (4.0 mi / .3 gal), but the results were 13.3 MPG and that seemed low. (I would expect low 20s.) Thus, the question arose.

 

The Owner's Manual is not too clear on these matters, but my assumption was that there likely was not an easy way of determining the efficiency of the system's separate drives.

[tombarker13ffh]

I would guess the 2.0 Atkinson on its own would do around 35-40 highway mpg, based on the lighter focus' 2.0, but it would have very little power or acceleration and not be very suitable for city driving.

[neod192]

I would guess the 2.0 Atkinson on its own would do around 35-40 highway mpg, based on the lighter focus' 2.0, but it would have very little power or acceleration and not be very suitable for city driving.

It can do that if it's not charging the battery. When the battery is charging I see about 20 MPGs on the instant bar. It's closer to 40 (or higher) when the battery is full.

[acdii]

It can do that if it's not charging the battery. When the battery is charging I see about 20 MPGs on the instant bar. It's closer to 40 (or higher) when the battery is full.

This is what I saw with a full charge, @65 MPH, full charge, it would be between 40 and 50 on the instant, and 38-50 on the SGii. The ICE can be efficient if it inst tasked with also trying to recharge the pack. The ICE in the 2010 I have is very fuel efficient on the highway, I see anywhere from 42-50 MPG depending on weather and traffic, and it has very little EV assist at that speed, and doesnt waste energy recharging the pack unless its doing a conditioning cycle, which is rare. The SOC in the 10-12 is usually around 50% at all times, only when cold or braking down a long hill will it go higher. I thought it was broke when I got it, but thats just how the Ford system works.

[hybridbear]

The ICE is still efficient when it is recharging the battery pack, see this thread: http://fordfusionhybridforum.com/topic/6606-why-hybrids-are-so-efficient/