Fuel Calculator Adjustment

[Noseoil]

Changed mine yesterday to 920 for the first adjustment, which may be a bit on the low side. It's winter here now & I'm at 6500' elevation, so this is just a first guess, but based on what I've seen over the last few months with calculations. I'm typically running 88 octane fuel here in Raton, but this varies with trips out of town. When we head up to Costco in Colorado Springs, I fill with better fuel & run more time on the freeway to & from (140 miles each way for the trip) & Springs is 1000' lower than Raton.

I wonder about elevation & fuel economy, as 6500' is much thinner air than people would have at sea level to work with. Power is actually dropped about 2.9% per 1000' due to oxygen content, so 6500' is a loss of about 18% or down to 220hp up where I live. Cold winter mornings is better, but 20 degrees is still cold!

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[RCMUSTANG]

I am curious, are you still chasing your tail with this gas mileage thing? Now that we are into winter blend gas do your calculations stay the same between hand calc and trucks readout?

I'm with +/- .2 . I guess that's as good as it gets. Cause sometimes it's high or low. But at .2 it's closer enough.

 

[RCMUSTANG]

9200 miles and the last comparison between computer and manual was 20.8 comp and 20.77 manual. I'm satisfied with my second and final adjustment.

 

[rpeterson53]

My 2019 Ranger Lariat fuel economy from the computer was anywhere from 1.2 to 2 MPG higher than what I was getting by calculating the MPG from the pumped gallons. I did the procedure using a correction factor .944. Both recent fill-ups showed the exact MPG match between the computer and my pump calculations. BTW, when fueling at the pump, I use the slow setting to first shut off, let the fuel settle down in the tank for about 30 seconds and then fill to the next shutoff. I do this each time to have as consistent results possible. For combined MPG, I'm seeing 19.4 to 19.8 which I guess is OK for the colder temps this time of year. I use 87 octane. I tried 92 once and did get a MPG of 1 mile better but not worth the added cost. Plus I noted no performance change on 92 octane since I'm driving a basically empty truck and not towing in summer temps.

 

[Racket]

Take your manual calculated mpg and divide by the computer calculation. Example 21 mpg manual cal divided by computer cal 22.3 = 0.9417. You can round up to 0.942. Multiply by 1000 gives you 942. Plug that number into step #7.

#1 Hold the left steering wheel center ok button down.
#2 turn accessory power on (do not start).
#3 you'll see ET appear (top of left screen, don't judge standard gauges so I don't know how or where that will appear).
#4 hit ok.
#5 Engineering screen will appear.
#6 hit arrow up to the AFE screen and follow screen to adjust.
#7 once set to desired numbers turn off ignition.
It may take 1 or 2 tanks to fully adjust to the change. That should get you closer to real mileage.

I've got a 2019 Ranger Lariat and following these instructions, I don't see 'ET' at Step 3 and can't proceed any further. Am I missing something, or is all of this FORScan dependent?

 

[Noseoil]

The "ET" shows up in the lower/middle/left of my display over the steering column when it's activated. Just reset to 940 & it should be about right now.

 

[RCMUSTANG]

At 10,000 miles I'm at 20.7 on the computer and 20.73 by hand on my last tank. Can't get closer than that.

 

[FX4Offroad]

At 10,000 miles I'm at 20.7 on the computer and 20.73 by hand on my last tank. Can't get closer than that.

Sure ya can... By .03!


(Guess it was funnier in my head)

 

[RCMUSTANG]

Sure ya can... By .03!


(Guess it was funnier in my head)

The stock doesn't display 0.00...….

 

[Snorebaby]

After 26 tankfuls, I finally adjusted my computer to 938, which is the average of 1.2mpg difference over the 26 tanks. We will see how close I am.

 

[Msfitoy]

So, one of the guys on my Fusion Sport forum just brought this to my attention that the mpg calculator can be adjusted. Take your manual calculated mpg and divide by the computer calculation. Example 21 mpg manual cal divided by computer cal 22.3 = 0.9417. You can round up to 0.942. Multiply by 1000 gives you 942. Plug that number into step #7.

#1 Hold the left steering wheel center ok button down.
#2 turn accessory power on (do not start).
#3 you'll see ET appear (top of left screen, don't have standard gauges so I don't know how or where that will appear).
#4 hit ok.
#5 Engineering screen will appear.
#6 hit arrow up to the AFE screen and follow screen to adjust.
#7 once set to desired numbers turn off ignition.
It may take 1 or 2 tanks to fully adjust to the change. That should get you closer to real mileage.

My Fusion at 26,000 miles was consistently around 1.3 mpg high on the computer. I'll monitor both once I drive and fill and compare manual to computer from now on.

I'm sure everyone else all figured this out but...#1 hold ok button down...#4 hit ok...was there a place between 1 and 4 where the ok button was let off?

 

[RCMUSTANG]

I'm sure everyone else all figured this out but...#1 hold ok button down...#4 hit ok...was there a place between 1 and 4 where the ok button was let off?

You let go when the ET shows up. The second one you hit. Not hold.

 

[gotwheels]

I adjusted mine to .952

 

[Geoff]

I adjusted mine (.938) and noticed that it also affected the fuel economy screen (as it should). Nice.

 

[JimH]

When doing your calculations do you account for operation in reverse, idling, temp, wind, load, exact mileage? Most gas mileage in the real world is a WAG (wild ass guess). You also have gas pump error or on purpose. I do a manual calculation every tank and round off in my log book. It is good enough.

Used to use SWAG when loading a C-130 in 'Nam --- (Scientific Wild Ass Guess)..

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