50 mpg is going to be on the high side for the new cars... expect low to mid 40s.

I get low to mid 40s with mine, but I have a short ish commute that's all highway, and I drive fast.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.