When I fill the gas tank, it says that the autonomy is 245, but specs says that in city shall be 345 and 437 in highway. Gas tank is 23 gals stock. What is wrong?

 

not sure what "autonomy" is...but the tank hold 23 gallons .

 

How many moler per tankfull?

 

What year is your GX?

 

Year 2007, gx

 

When I fill up on a highway trip (so getting about 18-19 mpg) I will get a range of about 360 miles from the display.
I think the VVT-i engines get slightly better mileage?

Click the image in my signature to see my mileage over the past few years.

Chip H.