My 2019 CX-5 over reports MPG by 1.55 MPG, 2014 CX-5 under reports by 0.97 MPG

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2019 CX-5 Touring
I noticed that my 2014 CX-4 seemed to almost always under report my MPG so I logged the actual MPG based on how many gallons each fill up took and the miles drive and I also logged what the car said I got for that fill up. Then I ended up buying a new one so I thought it would be interesting to compare.

Over 23 fill ups my 2019 computer said that on average I got 1.55 MPG more than I actually did. So it was off by +5.5%
Over 11 fill ups my 2014 computer said that on averaged I got 0.97 MPG less than I actually did. So it was off by -3.4%

I just found it interesting and thought others might also.
 
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