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I finally found the little button on the steering wheel that gives you the "tank MPG" and "MPG average". I have about 4700 miles, and the MPG average says 18.1. The tank MPG says 20.8 (highway about 70mph). In regards to the former figure, does that mean I have averaged 18.1 MPG since I got the car, abuse and all? That woulde be impressive. Check out yours, and let me know what you guys are doing...
 

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Yes, that means you have averaged 18.1 mpg since you got the car. I have checked the gauge routinely since I got mine. It appears that the computer is fairly accurate. On a per tank basis I actually calculate about .2 or .3 mpg less than is indicated. I have averaged 21.3 mpg over the first 14k miles.
 

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You guys must not be driving too fast or have alot of highway miles... I checked mine and I'm at about 15.5 mpg lifetime.... lol
 

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I finally found the little button on the steering wheel that gives you the "tank MPG" and "MPG average". I have about 4700 miles, and the MPG average says 18.1. The tank MPG says 20.8 (highway about 70mph). In regards to the former figure, does that mean I have averaged 18.1 MPG since I got the car, abuse and all? That woulde be impressive. Check out yours, and let me know what you guys are doing...
That is excellent mileage for everyday driving! If you push and hold the DISP button while on MPG average, it will reset it in case you just filled up and you would like to start all over again.
 

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Because I have driven on this road sooo many times, I thought it might be interesting to post this. To make the trip interesting, I like to see what MPG I can get out of a car. The winner is no shock. Temperature does play a part in the MPG. I have gotten 28 MPG in the IS-F rolling at 60 MPH in cruise.

Lexus IS-F (800 miles on the clock)
Seattle to Coeur D Alene, Idaho and back @ 70 MPH in winter = 25 MPG (673 miles)

Lexus IS250 AWD (15,000 miles on the clock)
Seattle to Spokane and back @ 70 MPH in fall = 31 MPG (586 miles)

Infiniti G35 2007 (10,000 on the clock)
Seattle to Spokane and back @ 60 MPH in winter = 27.1 MPG (586 miles)

Prius (25,000 on the clock)
Seattle to Spokane and back @ 60 MPH in summer = 57.7 MPG (586 miles)

Prius (15,000 on the clock)
Seattle to Spokane and back @ 60 MPH in winter= 47.3 MPG (586 miles)

The 586 is the same because when I got to the house I was visiting, they did the driving. Just incase you are suspicious like me.

Now back to reality. My work commute is stop and go between 35 MPH and 50 MPH. 12 miles each way. On a cold morning, I am doing around 17 to 18 MPG. On the way home if the sun is out and I can control myself :p, 21 MPG.

It is interesting to compare to my G35. I had to struggle to get in the 20 MPG on average. Yet for this monster IS-F, I have a fighting chance.

PS Gas in Idaho was $2.16 premium this weekend, $2.55 in Seattle. hmmm.
 
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