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I bought an RX350 a few months ago with 25,000 miles.   It now has 30,000.  I just went on a 1,000 mile 4 day trip.   My average for the entire trip was right at 22.5 mpg.   About 95% was highway and I drove 75 most of the time.  I was hoping to get closer to 24-25.   Any ideas why it was 22.5?   Would driving 70 give me the 24-25?   Some of the time I even drove 78-80 but mostly 75.   


Thanks in advance.   I tried searching and didn't see anything and felt this has to have been asked before.   I also saw that it hits "low fuel" when there  must be 3-4 gallons left.  

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