I currently have about 350 miles on my 14 ES 350. I'm averaging 21.5 mpg combined city and highway. Will this increase in time? Also, how do you set/reset the trip odometer? Thanks.

 

Is your MPG calculated, or what's displayed? If that's actual calculated MPG's, you have issues. Maybe bad gas???

Reset the trip odometer by holding the black button that's protruding out of the dash by the speedometer. You need to be on that screen when doing so.

 

It does get better, but you should calculate MPG based on actual miles driven and gallons purchased vs the estimated MPG in the trip computer.
That is only close to accurate on very long runs.

 

I have about 3,000 miles on my '14 ES350 and my mpg has ranged from a low of 24.4 city to 33.5 highway (calculated). I have not seen any significant increase in mileage but havent racked up that many miles yet. The drivers right foot probably effects the mileage the most. I usually use the econ setting and stay within the posted speed limits.

Push and hold the trip odometer reset button located below the tachometer to the left of the steering column and partially hidden by the headlight switch. It will reset whichever trip (A or B) is displayed.

 

There is no question that the two main factors that affect fuel economy are how you drive and where you drive.

I've had my ES350 for about 15 months. Fuel economy has been pretty steady throughout that time, with the exception of the expected drop in mpg during the coldest temperatures of the winter. My overall gas mileage (actually computed and not based on what the car's computer says) has been right around 32 mpg, and, when I've done true highway driving, I've gotten 34-35 mpg. But I live out in the country. Most of my driving is on country roads, and I do very little stop-and-go driving. Further, I drive rather conservatively, and I do, 99% of the time, drive in Eco mode.