Lexus IS 350/IS 250 Real World MPG Numbers

Just ran a full tank on the highway, about 340 miles no more than 10 miles in city conditions. Average speed 75 mpg (per the gauge). Fuel economy: 24mpg. THAT seems rather low. Any suggestions? Am using 91 oct. fuel and car has about 1950 miles on it. Got it in March...any thoughts would be appreciated... thanks

Jason

Replies to this message:

carmonkey (Jul 27, 2007 8:09 pm)

#38 of 41 My first tank has average 22mpg by nicecars

May 22, 2007 (10:23 pm)

My IS 250 has average of 22mpg. I have about 50% hwy, 50% local. It is below my expectation caz I used to have a toyota camry, which delivers average of 25mpg for 100,000 miles.

#39 of 41 Re: IS 250 Fuel Economy [freebird2000] by carmonkey

Jul 27, 2007 (8:09 pm)

Replying to: freebird2000 (May 22, 2007 6:26 pm)

You're still in break-in. Give the car another 2k-3k miles to see a jump in the mileage.

#40 of 41 MPG by jzalkin

Jul 28, 2007 (10:01 pm)

I am at 28mpg with 70-80% hwy. I have found that it drops if using cruise control and dips at and above 80 mph.

#41 of 41 Observation by ar39

Jan 14, 2008 (3:02 pm)

I've observed Sunoco premium gives me a better mpg over other brands of gasoline, with 75% hwy 25% city driving in my 2006 IS250 AWD.

Sunoco 91 - 28.4
Exxon/Shell 93 - 27.7
BP 93 - 26+

Measurements were taken in similar driving conditions. Also, these are not dash monitor reading but, miles/distance calculation. The car monitor shows variance of +1.3 miles.

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