New Car. Auto 4 Dr. Sedan. Direct me to easy 40+MPG

[fatlard]

Hello,

I purchased a 2010 Yaris Automatic Sedan last week.

I read up about DFCO but I am not sure how it would work on an automatic... so I not sure if this applies to me.

I plan to increase my air pressure up to 40PSI. I also been driving at 60mph on the first tank.

I know slimmer tires are better. I currently ave 185 /60R15. What slim size tire can I safely put on.

I know you guys try to keep rpm below 2000RPM.. but driving at 60 puts me between 2000 to 2500RPM

Thanks!