Crazy good mpg ---> 27 mpg

[EveryDayBronco]

This is photo of my display showing 25.4 mpg after 244.1 mile round trip (same return route) and my bronco still thinks it has 30" wheels when it really has 32" which have 6.3% larger circumference.

25.4 mpg x 1.063 = 27.0 mpg.

My Bronco is a 2 door base model with manual transmission, and big bend oem wheels & tires. No roof rack or other goofiness hanging off it.

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[Tricky Mike]

It's usually optimistic by 1/2 to 1 mpg, so I'd suspect what's indicated is very close to actual mileage.

 

[EveryDayBronco]

It's usually optimistic by 1/2 to 1 mpg, so I'd suspect what's indicated is very close to actual mileage.

My trip meter vs google maps shows a 8.1% advantage vs my 6.3% calculation for the circumference.

Using the 8.1% "extra" it would be 27.46 mpg.

The only true test will be tracking the actual mileage driven to and from exact locations starting with a full tank. Next time I do a trip with known destination (no detours) I'll do that!

I'm curious because this mpg is better than my previous vehicle which was a Subaru. If a Bronco can get better mpg than a Subaru then that's something!

 

[SeptuagenerianSasquatch]

Jealous!

 

[CalvinT]

I think you need to adjust the AFE bias in your computer. Broncos ship with it set at 1000 which gives optimistic mileage readings.

 

[Alfa]

tail wind? I saw 25mpg for 100 miles on my 4 door Wildtrak heading East on I-90 with 3 people and lots of luggage. We had a very brisk tail wind.

 

[JL8jeff]

Do you record the actual amount of gas you get at each fillup and write down the miles? One tank can look really good if it doesn't get filled all the way so you really want to look at multiple fillups for a decent avg number. The truck's computer can overestimate by .5 to 1.5 mpg and with your tire change and no correction done, I think the overestimate is extra high for you right now. I went from 35's to 37's with no computer correction in Dec and I'm still seeing higher than normal overestimates by the computer.

 

[Brian_B]

 

[crenca]

Your 2 door base model (i.e. lowest in GVW, unusually low {for a Bronco} unsprung and rotational mass with small wheels/tires) is optimal, particularly that it has no mods (such as roof racks) that significantly degrade an already poor Cd measurement (relative to most other vehicles).

You don't mention the conditions of this reading other than saying it was "a trip" - highway miles, obvoulsy not at 75mph...averaging in the low 60's mph at most?

Don't take this the wrong way, but who cares? No one (and I mean no one) should be buying a Bronco for the gas mileage. The vast majority of Bronco owners, who drive a mixed cycle and normally (i.e. they are not trying to be amateur hypermillers), are going to be getting something like 17/18, maybe 19 if they are lucky. They will read the computer readout and assuage themselves with its optimistic (i.e. fake) readings of around 20.

Oh I as well don't believe you, and neither should you

 

[Brian_B]

The computer MPG calculation is already sketchy as all get out and notoriously optimistic. Apply another equally sketchy calculation on top of that based on advertised tire size, not actual measured diameters.

At least you published for peer review.

Now, maybe you really are getting 27MPG, but you need to show a legit distance (not from your odometer, as you've already established it isn't accurate -- side note, why don't you fix that, it's easy to do with Forscan?) and fuel receipts showing how much gas you burned doing it.

 

[userdude]

Best mileage I got was early on with my 2dr BL Sas: 24.mumble-mumble. Which as others note, is more like 23mpg. That was staying below 60mph, avoiding the gas pedal (boost) and taking backroads and country highways for a couple hundred miles. Just a few stop signs, etc. Stock GY's. Probably ECO mode, but can't recall.

 

[Jakob1972]

Yup it is possible, We get better gas millage when we get out of Texas for some reason but this is a stretch from Balmorhea TX to Phoenix AZ on our way to Vegas / Sand Hollow/Moab last year. My wife was following me in our MY22 Everglades (probably the heaviest stock Bronco, non Braptor) with no roof rack I was pulling a 26' TT and she would fill every time I had to stop. I was filling 20 gallons and she was filling 8 gallons. didn't print receipts don't need the extra trash. She would reset the MPG estimator at each fill up and I would hand calculate the MPGs just to check, I was getting 11.1 MPG pulling the trailer in my MY22 4 cylinder silverado and she was getting 27.7, so that was just cruising behind me but not up my a$$ either. I was holding the legal speed limit for a vehicle with trailer at 70mph.

 

[Jakob1972]

Worst MPGs I got pulling my squaredrop (in Sport mode 2h) to SPI in a pretty good head wind, moving at 80 mph, that will get you in the single digits MPG. 8 to be exact.

 

[buckingup]

Do you record the actual amount of gas you get at each fillup and write down the miles? One tank can look really good if it doesn't get filled all the way so you really want to look at multiple fillups for a decent avg number. The truck's computer can overestimate by .5 to 1.5 mpg and with your tire change and no correction done, I think the overestimate is extra high for you right now. I went from 35's to 37's with no computer correction in Dec and I'm still seeing higher than normal overestimates by the computer.

So if you don’t fill up your tank all the way, the mileage won’t be accurate? I usually put in about 10 gallons (50$) at a time…. Could that be a reason I’m seeing 16.6 mpg? Or does my Bronco think I’m cheap?

 

[Philvis77]

Best Ive achieved on a 700 mile trip down I-95 at 80+ mph speeds is 20 mpg. Typical is 17 mpg. I might have a stroke if I got 25 mph, much less 28!

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