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No, you should be getting better than that. Have you recently purchased this car? Do you know the maint history? If you do not know the history, it would be a good idea to consider a complete tune-up,
Is it normal for my Es to get an average of 15.4 MPG overall?
No, I used to get 19mpg combo of highway/city with my 95 es, 145K miles. After spark plug change, pcv valve change, and a throttle body cleaning I am now getting 22mpg.