Instant Mileage - How accurate?

[Guardian_Actual]

Don't laugh too hard.

With 93, tires at 35cold psi, at 49mph finally dropping into 10th with the AC off, windows up, bed cover laid out, the instant mpg readout says.....55+/- 2 mpg.

Impossible right?.....right?!

Sponsored

 

[Radioman]

Don't laugh too hard.

With 93, tires at 35cold psi, at 49mph finally dropping into 10th with the AC off, windows up, bed cover laid out, the instant mpg readout says.....55+/- 2 mpg.

Impossible right?.....right?!

Going down a long hill?

 

[Guardian_Actual]

Going down a long hill?

Straight & Level road here in FL

 

[Joeiconic]

Going down hill I usually hit 99.

 

[Chris M]

Don't laugh too hard.

With 93, tires at 35cold psi, at 49mph finally dropping into 10th with the AC off, windows up, bed cover laid out, the instant mpg readout says.....55+/- 2 mpg.

Impossible right?.....right?!

My truck does that, so no, not gonna laugh. On level ground in Phoenix it'll drop into 10th at 48mph and the mpg on the instant screen regularly goes up to the high 40's/low 50's. Won't stay there, but it'll go for awhile.

 

[subquark]

I get the same and often peg out at 99, but overall MPG is exactly 18.0 (just looked yesterday). But only when I take my foot off the gas on a downhill stretch, once the foot hits the accelerator, it goes back down (and this is all without having cruise control engaged).

 

[Jason B]

At 70, on a flat road, with AC and cruise, my Instant MPG pretty much matches my lifetime MPG at 24. But going up an overpass, it drops to 15 MPG or so, then jumps to 70+ going down.
55 MPG is unattainable.

 

[Grandaccess]

I use one of my Trips I reset it once a month so it averages for the miles gone, last month 2400 and averaged 20.2 that is across City/Hwy/Towing around N.Y hills and once and a while beating on it

 

[Dr_Strangelove]

@Guardian_Actual it's important to remember that the Instant MPG is literally an instantaneous readout. You can use it to ballpark whether you are using the skinny pedal too much or too little and adjust accordingly, but the readouts are fairly useless data otherwise. You need to factor all of the times that your truck was achieving 5mpg as the truck was just getting going with all of the times it was achieving 55mpg as it was going downhill at mild highway speed and average them all out.

What the truck is saying to you in that readout is "if you can keep this exact moment 55 miles long you'll only use one gallon of fuel!"

 

[rang19ca]

On my recent 500 mile trip, mostly highway, I got 22.23 mpg hand calculated. The dash lifetime reading is 21.2 but that is more local driving.

 

[mtsoxfan]

I watched mpg for a few K when I first bought the truck and hand calculated vs read out was less than 1 mpg. Accurate enough for me. Better things to obsess over...

Sponsored