How about the other way - teaching your parents to hypermile? My mom is now getting 27-28 MPG out of the '04 Toyota Sienna (rated 20) and my dad gets close to 40 out of his dealer car ('17 stock Mazda 3 hatchback).
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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