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Instantaneous/Current Fuel Mileage Indicator

Hyundai Sonata The Sonata has grown to be the premier mid-sized sedan of the Hyundai name with the many interior options and the powerful V6 engine.

Instantaneous/Current Fuel Mileage Indicator

Old 01-06-2019, 11:09 PM
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Join Date: Feb 2011
Posts: 7
Default Instantaneous/Current Fuel Mileage Indicator


Anybody ever wonder what the real fuel mileage is when you are driving your hybrid down the road and the gas engine is running???

The meter on the dash says that much of the time I'm getting 50 MPG. Silly me, I believed it - for a long time. But being the curious type, I grabbed a free Android OBDII code reader app and my bluetooth OBDII dongle and spent the last couple of days monitoring what the car is doing and it was a bit of an eye opener.

Folks, Hyundai is lying to the tune of greater than 100% over statement of the actual fuel mileage when the gas engine is running. I'm a little peeved.

I have no complaints about the end result, which is, the average fuel mileage reported varies between 42 and 52 MPG. I have 3.5 years of records where I've verified the fuel mileage of every tank of gas and what I've found is the reported average fuel mileage is approximately 6 - 8% higher than what I calculate. Of course I'm assuming that the odometer and fuel station pumps are "accurate". At fill up today my reported tank average was 46.1 MPG. All in all, not too shabby.

But back to the instantaneous/current fuel mileage. I'm really unhappy to see 22 - 25 MPG reported by the engine ECU showing on my phone while at the same time, the dash display is merrily telling me my car is so incredibly efficient by pegging the meter at 50 MPG.

I always wondered why I would be driving along with the instantaneous/current fuel mileage indicating 50 MPG and see the reported average fuel mileage drop down a tenth of a MPG - while going downhill!!!. Now I know. Hyundai is "massaging" the data they display in favor of leading owners to believe they are getting better fuel economy than they really are.

I understand that the number is lower because the battery is also being recharged when the gas engine is propelling the car but I don't see any real reason to not report what's going on honestly/accurately.
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