The times I calculated by the pump the numbers matched the dash readout pretty closely.I’m testing what the mileage gauge says on the dash vs. calculated mileage. Only 3 fill ups so far, so nothing conclusive, but my calculated mileage seems to be 1-2 mpg less than the gauge shows. Time will tell how accurate the guage is.
I am wondering if any other folks have checked to see how accurate the dash mpg guage is.
That's a good point. I like the gauge for checking the performance of my own vehicle on different routes or at different speeds, but they collect gas taxes at the pump. If I had to put it on my tax form it might be an issue. Otherwise, you get what you get. As long as you don't run out ( of gas!).What does it matter if the gauge is slightly off?
If it the computer says I got 24.6 mpg but in reality I only got 24.3 mpg.... so what?
I can’t say about the CX-5, I do know that other manufacturer’s vehicles can be damaged. The fuel backs up into the venting system, throws codes and is costly to replace. I too used to top off, but my last vehicle “trained” not to do so. You seldom get too much more in anyway.I’ve read were top-offs can damage your vehicle’s vapor collection system. I’ve been topping off for 50 yrs with no apparent consequences. Does anyone with a newer CX-5 have any 1st hand experience with topping off vs. damaging your car’s emission system? I’ll quit doing it if it is a factor on my 2021 CX-5.
What does it matter if the gauge is slightly off?
If it the computer says I got 24.6 mpg but in reality I only got 24.3 mpg.... so what?
If the gas gets into the tube that leads to the charcoal canister it contaminates it.I can’t say about the CX-5, I do know that other manufacturer’s vehicles can be damaged. The fuel backs up into the venting system, throws codes and is costly to replace. I too used to top off, but my last vehicle “trained” not to do so. You seldom get too much more in anyway.
Do you have the turbo or non-turbo engine, and what is your % mix of city/hwy driving? Is your mpg calculated or what the mpg readout says?My over all average mpg is 27.2 based on the car's display. That includes short trips to the grocery store.
Yes, measure calculated at the pump is actually always, 100% of the time, a few tenths or so better than the dash read out for me.The times I calculated by the pump the numbers matched the dash readout pretty closely.
Accuracy calculating by the pump relies on the accuracy of the pump, so there is some possibility of error there.
My 2015 on the same commutes averaged about 24-25. I am doing 2mpg better with the 2019 turbo.The problem with asking someone their mix of “highway” and “ city” driving is that...the definition of both varies, a lot. For highway driving, some folks drive 65 mph on flat ground near sea level while others drive 85 mph in the mountains. For non-highway driving some will drive where there are stoplights every block, some were there are lights ever one or two miles apart. Some drive with a heavy foot, some drive for economy. With such a wide variation in driving styles it’s very tough to get a true idea of the differences without a large sample. Results from five people won’t do much good.
Non turbo. I drive about 40 city 60 highway. The 27.2 is what my display shows. It had reset last year when I had disconnected the battery, and since then it has 27.2.Do you have the turbo or non-turbo engine, and what is your % mix of city/hwy driving? Is your mpg calculated or what the mpg readout says?
The EPA MPG ratings for 2.2L diesel CX-5 AWD (28/31/29 city/hwy/combined) definitely are lower than your real world experience. On the other hand your mpg’s on 2.2L diesel CX-5 are still lower than those diesel CX-5’s in other countries, especially the highway mpg.2.2 diesel (2019 USA) .... 32.5 mpg avg weekly mix and 35.5 mpg straight up highway travel