Computer mpg estimate off by a lot

[Scupking]

Just filled up. Computer said I got 38.3mpg for this tank. Got 412 miles out of the tank. It took 14.13 gallons to fill up. So looks like I only averaged 29.15mpg for the tank. The computer is almost 10mpg off?

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[bajesus8]

MPG Correction Tutorial - AFE Bias Adjustment (via Engineering Test Mode) | MaverickTruckClub - 2022+ Ford Maverick Pickup Forum, News, Owners, Discussions

Last post is in regards to 2025 models

I have a 2025 and was having a lot of trouble getting this procedure to work. The screens are very different from prior years. I think I have figured it out for 2025 model year.
Procedure to access Engineering Test mode is the same. Hold OK and press start- keep holding OK until a grey ET shows up on the dash. At this point I waited for a while for the alerts to cycle through. After I cleared the seat belt warning, I still had ET on the dash but had a blank screen. When I toggled up/down with the button, I saw the screen like, acknowledge that I changed something but I still couldn't see anything.
Next, I hit the hamburger stack on the right of the steering wheel- The three stacked lines. That was the needed input. Engineering test screens became visible and I was able to edit my afe bias down to 950 (all of my actual mileages have been 5% off).

tldr: hold ok to enter ET mode. if you can't see the info screens, hit the three stacked lines button.

 

[Scupking]

MPG Correction Tutorial - AFE Bias Adjustment (via Engineering Test Mode) | MaverickTruckClub - 2022+ Ford Maverick Pickup Forum, News, Owners, Discussions

Last post is in regards to 2025 models

I will have to look into that. Though mine is 35% off... Seems a little extreme.

 

[Darnon]

Do you remote start a lot? That fuel consumption may not be factored.

 

[Scupking]

Do you remote start a lot? That fuel consumption may not be factored.

I do, 15 minutes before heading out most mornings. That equals about 5 hours of warmup time during a month.

 

[710-oil-614]

My most recent fill up the computer was almost dead nuts on the money.

39.4mpg on board computer vs 39.7mpg hand calculated!!

All time is still 32.1 hand calculated vs 33.4 on board - so I’m right at that 4-5% optimistic error.

Will adjust around 5,000 miles to see if it makes a difference.

 

[The Real Maverick]

A) you suck (fuel)

B) you can fix it so fix it

 

[colinl]

I do, 15 minutes before heading out most mornings. That equals about 5 hours of warmup time during a month.

bet this is it, though.

You could not remote start for your next entire tank of gas and see what difference it makes.

 

[The Real Maverick]

bet this is it, though.

You could not remote start for your next entire tank of gas and see what difference it makes.

I'm gonna bet about 8 mpg difference.

 

[Scupking]

bet this is it, though.

You could not remote start for your next entire tank of gas and see what difference it makes.

Now that the weather is starting to warm I will not be remote starting as much.

 

[colinl]

Now that the weather is starting to warm I will not be remote starting as much.

I kinda see what Ford might be intending since they're showing miles of actual travel and the gas spent doing so. but the fuel is getting consumed, so it's kind of disingenuous to exclude fuel spent idling after a remote start.

 

[rlhdweman]

I kinda see what Ford might be intending since they're showing miles of actual travel and the gas spent doing so. but the fuel is getting consumed, so it's kind of disingenuous to exclude fuel spent idling after a remote start.

Don't know about a hybrid, but my Eco figures in idle time in fuel economy.

 

[colinl]

Don't know about a hybrid, but my Eco figures in idle time in fuel economy.

mine does also... and I can't recall anyone else with this issue, so this might be a 'feature' for 2025 or even more specifically, 2025 hybrids.

 

[The Real Maverick]

I kinda see what Ford might be intending since they're showing miles of actual travel and the gas spent doing so. but the fuel is getting consumed, so it's kind of disingenuous to exclude fuel spent idling after a remote start.

Might not be intentional.

Might be a side effect of one computer module not being "awake" during a remote start.

 

[The Real Maverick]

Here's another side effect, glitch, or whatever.

I am in very hilly territory.

I can "coast" downhill for 5 miles with engine off the whole time; yet my distance to empty goes down by 5.

Some times. Some times not.

What does this say? I must need to move the average since reset by more than 0.1 MPG for it to "recompute". It is not up to date in realtime.

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