2019 Civic Turbo Fuel Gauge.....

[EEZABLADE32]

… problem. Only done 300 miles and the remaining fuel display
is going up and down like a yoyo. Went from 69 miles in tank to 111 after a few miles. Then it went from 75 to 52 after doing 5 miles. Any ideas, thx.

[gingejbee]

I, too, have a 2019 car and if this were happening to me, I'd be popping in to a local franchised dealer for attention under warranty. You really shouldn't have any problems in a new car....particularly a Honda.

[bhg481]

You say fuel gauge but do you mean Trip Computer readings? I don't know the Honda Civic but neither do I know any car whose fuel gauge is calibrated in miles.
If it is the trip computer, be aware that the remaining mileage is usually calculated using the average fuel consumption achieved over the last few miles (about 25 miles in my car). If you have been driving in a town (getting poor fuel consumption) and then change to open-road (good fuel consumption) the estimated distace remaining will go up. Similarly, if you've been driving steadily and then come into a town the estimated mileage remaining will drop.

[nescio]

the remaining distance is calculated on fuel consumption. As your journey progresses, it will necessarily increase, as the consumption is higher when you start with a cold engine. Hard acceleration and start stop driving over short distances will bring it down, so your readings appear quite normal.

[nescio]

beat me to it, bhg

[gingejbee]

^^I was thinking along those lines too, bhg, but thought that the "remaining miles" figures were differing too much, too quickly.

[bhg481]

There is clearly very little fuel in the tank for the estimated miles remaining to be so low and this will contribute to wider fluctuations in the miles remaining.

[Buenchico]

As others have suggested, when you've got so little fuel in the tank, the 'distance to empty' (DTE) figure (as my car calls it) will change quite rapidly depending upon the driving conditions at any one time.

For example, when I set off to the shops today (about 10 miles away) my dashboard was showing the DTE as 98 miles as I left home and was driving locally 'around town'. Once I got out onto the A14 it rose quite quickly to 114 miles but, as soon as I got stuck in a bit of traffic it dropped equally quickly to around 100 miles again (although I'd done ten miles since it had read 98 miles).

I obviously need to refuel soon and, based upon past experience, 'DTE' will then show about 550 miles when I start off with a full tank. If I immediately drive out onto motorway-style roads (in free flowing traffic), that might rise to over 600 miles after I've only gone a short distance. However if, as soon as I leave the filling station, I join traffic crawling around town, it will drop to about 480 miles very quickly.

It's all perfectly normal and due to the onboard computer making estimates based upon your general driving style and the prevailing traffic conditions. If you've only done 300 miles in the car, it's still learning about the way you drive, so the figure you see will keep changing as the computer keeps reassessing how efficiently you're driving.