my 2016 eco-diesel still gives me 22 - 23 MPG at Cross Country Highway at 70 - 75 MPH driving, using Cruise Control.
You are going to be disappointed with your Gasoline mileage, from now to May.
You will be driving using Winter Blend gasoline
terrible mileage & lousy power
For some made up reason, California drivers that have Gasoline powered vehicles, will not change over change over until October.
As you may have heard, Gasoline users in California are paying $6.00 USD a Gallon
Some #2 Diesel stations are charging more than that