MPG high and low scores?

[PC_GUARD]

My overall average is 18.6 mostly city. That's for the 10 months I've had the car.

On a trip all turnpike/interstate 28 mpg on e free 93

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[DopamineQuest]

Mine is 17.9, Shelby's are rated 12/18, doing pretty well!

I drive 70% highway.

 

[MidnightStars]

Yeah, how do you do that?
I think my gauge is overestimating by a similar amount.

What LxMike said--he just replied to the wrong person:
Link is here: How To Adjust Your Indicated Average Fuel Economy | 2015+ S550 Mustang Forum (GT, EcoBoost, GT350, GT500, Bullitt, Mach 1) - Mustang6G.com

 

[HolubS]

Filled in St Louis, MO with 93 octane, drove ~240 miles to Cedar Rapids, IA at 5 MPH over the speed limit. I haven't recalibrated my MPG meter, it reads 1-2 MPG high. I have measured up to 40 MPG if I have a tail wind.

 

[Angrey]

These discussions are wildly inaccurate unless using the old method for manually calculating based off odometer reading since last fill up and volume readout at the pump.

100+ years later and Ford still can't engineer an accurate fuel level gauge. I realize the computer calculates the economy off of other sensor parameters, but it's all indirect and subject to inaccuracies.

 

[Cory S]

These discussions are wildly inaccurate unless using the old method for manually calculating based off odometer reading since last fill up and volume readout at the pump.

100+ years later and Ford still can't engineer an accurate fuel level gauge. I realize the computer calculates the economy off of other sensor parameters, but it's all indirect and subject to inaccuracies.

It’s still mostly calculated by vacuum/load. Has been since the late 80’s.

 

[jayhoogs]

My best was the drive home picking up the car from VA to NJ, was about 23-24 MPG I think. Since then most of my driving has been commuting to and from work, mostly highway but usually decent levels of traffic, and I typically average around 14-16 MPG.

 

[Angrey]

It’s still mostly calculated by vacuum/load. Has been since the late 80’s.

Yup, and it can vary wildly depending on all sorts of contributing factors.

The good old "I traveled x miles using y gallons" is still the best/most accurate measure of fuel economy.

 

[Cory S]

Yup, and it can vary wildly depending on all sorts of contributing factors.

The good old "I traveled x miles using y gallons" is still the best/most accurate measure of fuel economy.

Yep. Fill, drive, fill, calculate.

 

[Gnatsum21]

Yup, and it can vary wildly depending on all sorts of contributing factors.

The good old "I traveled x miles using y gallons" is still the best/most accurate measure of fuel economy.

Since we are all using the "wrong" method we all should be able to compare the wrong MPGs, or whatever it spits out, or?

 

[ShadesOfBloo]

These discussions are wildly inaccurate unless using the old method for manually calculating based off odometer reading since last fill up, and volume readout at the pump.

That's how I know my dashboard display is optimistic: It has told me I was getting 21 mpg, when my calculation from the trip odometer and pump display gave me 19.something. I think it was a difference of about 8%.

 

[Angrey]

Since we are all using the "wrong" method we all should be able to compare the wrong MPGs, or whatever it spits out, or?

Interesting question. Depends on the error. If the error was always consistently in one direction and the error was consistent magnitude or at the very least, distributed tightly, you could use for comparison from one bad measurement to the other. But even if that were true, it would neuter the exercise of using any sort of comparison against traditional or common MPG values.

 

[LSchicago]

Looks like I'm more lead-footed than some. My average seems a bit low.

Let me know when it gets under 6.8. LOL.

 

[TrueBlue22]

2022 2.3L HPP, with just over 2100 miles. All driving has been with 93 octane gasoline. This time of year here in Michigan that means "winter blend fuel" which is known to knock down MPGs.

Short-hop city driving: 21mpg
Most recent highway trip: 310 miles round trip to Allendale, most all highway at 75-77mph: 26mpg

Don't even ask what happens when I put it in Sport and drive it like a lunatic.

For comparison, my 2011 5.0L Convertible gets 21mpg all the time, mainly because (A) it doesn't get driven very often, and (B) when it does, I'm driving it really hard because it's the fun car and MPGs just aren't a priority.

 

[KingKona]

Ya'll need to try varying your tire pressures. Makes a huge difference.

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