Color me impressed.

I had a few business trips on the most notoriously jammed stretch on Interstate: the woefully overcapacity and overcrowded segment of I-4 between Orlando and Tampa.

I try to avoid traffic which is impossible, and this portion of I-4 has portions heavily traveled by trucks - even during off peak hours. In heavy traffic I set my cruise control a few miles under the posted speed, drive with lane assist, and in Eco mode. On the road, I’m generally a slower driver. I use my sports car if and when I want a dynamic driving experience.

Imagine my surprise when I registered over 42 mpg in my 2025 ES 350 Ultra Luxury. This is as good as I managed in a Passat B 5.5 which was a 4 cylinder, well optioned manual that ran on premium. And it was a car I truly loved.

 

Nice mileage! The naysayers will come in shortly and tell you that figure is meaningless because it was not a 2-way run. Then they will say it was probably a downhill slide. Thing is they probably never got over 30 mpg let alone over 40 mpg and are just jealous.

 

I can show our hybrid RX getting 99.9 mpg. The reality is the V6 cannot achieve 40+ mpg under typical driving conditions. Nothing to do with naysayers.

 

Well Mike...it can....if you use an imperial gallon. I got that frequently with the '14 and I believe that the '20 will be no worse (if anything a tick better because of the final drive ratio and lower engine RPM at cruise). The multiplier is 0.83

 

I get about 35 MPG doing same in my '25 UL in Normal mode. I will never drive in ECO mode. I get 38 MPG doing same (Touring Mode) in my 500 HP C8 Corvette. I4 is not a place to live, or drive. It's not as bad as driving in Metro Washington D.C. though.

 

I avg 28 at best but right after a fill, I drive to work and the avg is well above 30, maybe as high as 35. I park, them come back out for lunch where I do several minutes of local driving and guess what happens to that average!!!

 

Nice but this figure is meaningless because it was not a 2-way run. It was probably a downhill slide. I never got over 30 mpg let alone over 40 mpg on my ES, I'm not jealous.

 

The mpg gauge in the infotainment is not as accurate as filling the tank and figuring out the mpg's. Also , you have to fill the tank consistently every time you fill up. A few extra clicks might be a half a gallon and fool you into thinking you achieved higher mpg's than you really got.

 

😂😂😂

 

Thanks for the positive and encouraging response. I feel the brotherly love oozing from the orifices of everyone in this online community.

My daughter is in advertising and has been gracious enough to let my drive a press fleet car and a car being used in an ad campaign. Both offered nearly the same mpg, the first being a 2025 Rolls Royce Phantom and the second being a pristine LFA. Both are solid economy cars.

 

As said the best way is fill up and calc miles driven / gals used over the same path same speed etc when you fill up again and use the same station, operate the pump the same way as the 1st time, like auto click off or 1 more squeeze, this will only give average mpg over the distance traveled. On the highway say about 60 mph in ECO with AC on, cruise on (no radar distance set to prevent auto breaking) on a relatively flat road I have done the mpg reset and immediately see the mpg go way up there like near 35+. To me proves under these sort of perfect conditions it has some sort of accuracy but I rely on miles/gals.

 

Mike is correct. Need 2 way average, with starting and ending point your garage, i.e., no starting the meter once you're at speed (cheating).

As Mike said, on my CT200h and ES hybrid in the past, i could easily get a 99.9 mpg rating while going to the beach, going down a mountainous road. but go back up and you'll average out.

Realistic two way trip, while trying, I got about 46.6 mpg average on my es hybrid. the 1st part of the trip was about 56 or so. 120 miles total. So I'd say mid 40s on hybrid is about right, and upper 20s to low 30s on ES350 is about right, though mike can chime in on that one. He's in charge of the ES350s here.

 

Determining vehicle gas mileage is a little more complicated than methods being posited here in this thread. Here is how the U.S. EPA tests for vehicle fuel economy.

https://auto.howstuffworks.com/fuel-...-explained.htm

 

ya i dont think people here are really taking a scientific government interest into determining fuel mileage of a car. you can google "how the government determines fuel mileage" for that.

instead, they want to know what their particular car can do, under their conditions, under their temperatures/driving habits. it's a bit of a game.

 

I avg around 28 with my daily commute which is primarily freeway. No mountains up or down