Check tire pressure cold, if you drive it for a bit, they are not cold.
I get about 1-2 miles extra on a charge for my 2017 Ford C-Max Energi by increasing tire pressure from 38 to 40PSI.
Max cold tire pressure for Standard Michelin tires is 44PSI.
Higher Pressure reduces traction and reduces tire life, but increases efficiency.
Lower Pressure increases traction and reduces tire life, and reduces effeciency.
If you were in ice or snow, your could lower the pressure a bit to get more traction, but except worse mileage.
You could put 6 or 8 ply tires on it, and put maybe 60PSI, and get better efficiency, but they are heavier and ride a lot rougher.
My gut on this is, use the Ford Recommended Tire Pressure of 38PSI cold.
I get 100-200mpg average, I might get a little more, but is it really worth all the effort?
Thank you.
