Is there any car that doesn't get horrible gas milage during accelaration?

i Currently drive a 2013 Honda Civic which has a meter in the dashboard that reads from 0-70 MPG with a 35 mark in the middle but it usually goes to 70 when i let off the gas then if i press the gas down even like insanely lightly. It goes to 15 mpg and its hard to tell what its at because it changes so much. So please help if you have any good input on the situation

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