GEN 2 Mpg innacurate reading on cluster vs pump method

[Msb.19d]

Seems like op just asked a question, but so many of you just feel the need to be jerks towards people rather than just help or not reply at all. This is reason this forum suck 99 pct time

 

[smurfslayer]

I have about 2,500 miles on my new truck and the cluster is showing anywhere between 17-18 MPG after running a tank of gas through. Every time I have filled up I check the MPG manually at the gas pump and am usually around 15MPG. Is this normal to be about 3 MPG off from actual MPG when checking manually. That is around 20% off. The truck should be broke in by 2,500 miles. Last night the cluster said 18 MPG and I only was getting 15.01MPG. Before the starbucks trolls come out I didn't by the truck for good MPG but this seems odd to me. Maybe the cluster reads the average MPG over the last 30min or so. Does anyone else know? Or have the same issue?

These mileage calculations from vehicle computers or distance to empty, etc. are only done on simple math with a given set of sample data. that sample data is a point in time estimate which is only accurate for that point in time. The F150 sampling is on a regular basis but it’s still just executing math based on “known” input values.

These estimates are like the Pirate Code; More like guidelines.

On your fill ups, are you filling until fuel will no longer fit, or stopping when the pump stops? If you fill up on a slight hill, the pump stops sooner, and the neck could fill sooner, and each fuel pump cuts off at a different point.

Don’t chase your tail by obsessing over calculated fuel added vs. miles driven as opposed to what’s shown on the screen. Life is too short.

change to the power distribution screen and drive around in 4a. it’s much more entertaining.

 

[MGD]

I have about 2,500 miles on my new truck and the cluster is showing anywhere between 17-18 MPG after running a tank of gas through. Every time I have filled up I check the MPG manually at the gas pump and am usually around 15MPG. Is this normal to be about 3 MPG off from actual MPG when checking manually. That is around 20% off. The truck should be broke in by 2,500 miles. Last night the cluster said 18 MPG and I only was getting 15.01MPG. Before the starbucks trolls come out I didn't by the truck for good MPG but this seems odd to me. Maybe the cluster reads the average MPG over the last 30min or so. Does anyone else know? Or have the same issue?

In order for the dash to read correctly, you need to reset it at each fill up. As you continue to do this, the truck learns more and becomes increasingly accurate. My Ford dash MPG per tank numbers have been quite accurate to hand calculation.

 

[rtmozingo]

In order for the dash to read correctly, you need to reset it at each fill up. As you continue to do this, the truck learns more and becomes increasingly accurate. My Ford dash MPG per tank numbers have been quite accurate to hand calculation.

Wouldn't say you need to reset each time (tho it makes it easier for hand calcs), as I've not really done that, but mine has been pretty much spot on with my pump calculations every time I've checked. 16-18 MPG, within .5 mpg each time

 

[BurnOut]

As someone else mentioned, I don't trust mine for absolute numbers... I just use it as a basis of comparison. If it says that I got 17.4 MPG on my current tank vs. 17.1 last tank, I am seeing a mileage improvement. Is it actually .3 MPG? Most likely not, but it at least tells me worse/same/better.

 

[brownkc81]

On your fill ups, are you filling until fuel will no longer fit, or stopping when the pump stops? If you fill up on a slight hill, the pump stops sooner, and the neck could fill sooner, and each fuel pump cuts off at a different point.

Don’t chase your tail by obsessing over calculated fuel added vs. miles driven as opposed to what’s shown on the screen. Life is too short.

change to the power distribution screen and drive around in 4a. it’s much more entertaining.[/QUOTE]

I have filled up at the same pump and fill one or two pumps after initial stop. You're right I should just change to the power screen. I just thought that 3MPG off was a little excessive but I may just be wrong for thinking it would be more accurate. Thanks for the input.

---------- Post added at 11:09 AM ---------- Previous post was at 11:06 AM ----------

In order for the dash to read correctly, you need to reset it at each fill up. As you continue to do this, the truck learns more and becomes increasingly accurate. My Ford dash MPG per tank numbers have been quite accurate to hand calculation.

I do reset it at each fill up. The result has been the same for 2,500 miles. About 3 MPG off from the cluster. Maybe mine is just not as accurate. No big deal just seeing if anyone else has had the same issues.

---------- Post added at 11:10 AM ---------- Previous post was at 11:09 AM ----------

Wouldn't say you need to reset each time (tho it makes it easier for hand calcs), as I've not really done that, but mine has been pretty much spot on with my pump calculations every time I've checked. 16-18 MPG, within .5 mpg each time

How many miles are you at? That is good that yours is that close maybe mine is just an odd ball.

 

[MikeEby]

Curious what grade of fuel the OP is using?

If Ford uses simply the amount of gas that is flowed to the injectors then on lower grade fuels the amount used compared to the actual amount of power generated could be different than someone that uses a higher grade of fuels that generate more power per gallon.

If Ford calibrates the readout based on a higher grade fuel then it might account for some of the difference.

Does that make any sense?

PLEASE DON'T TURN THIS INTO A THREAD ABOUT WHAT GRADES OF FUEL THAT ARE RIGHT FOR THIS TRUCK!

Mike

 

[murph145]

I just fill my truck and other vehicles up when that small pointy red stick is really close to the E on the fuel gauge. Seems to work for me most of the time.

 

[xxaarraa]

I just fill my truck and other vehicles up when that small pointy red stick is really close to the E on the fuel gauge. Seems to work for me most of the time.

That sounds like the most unscientific method I ever imagined possible.

 

[murph145]

That sounds like the most unscientific method I ever imagined possible.

Lol I just keep it simple