balance the MPG of my suburban with my Lexus CT200H

[AZCreeker]

Average on the school Run our Suburban get about 17,
so for my 75 miles commute here is how I get our family average MPG back to decent:
15 Lexus CT200h, Firehawk Indy 500 tires, on F Sport S.E wheels:

 

[08HoeCD]

Let me see if I got this right: you bought a new car to improve your 'fleet average mpg?'

I hope I'm wrong. lol