poor gas mileage on 1997 Lexus ES300

it seems like this car has poor gas mileage is this common for this car being a v-6 engine.

Asked by for the 1997 Lexus ES300
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If your gas mileage is less a scan tool can be used to measure fuel trim figures to see if they are abnormal.
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I'm having the same issue. Some tanks i get great gas mileage then with similar driving the next tank i will get 20 mpg with highway driving.