[Emry]

I consistently get 33 MPG from my base RDX on highway by going 70 MPH on cruise. Additionally, I

• 
  use full synthetic 0W20 Mobil1 oil every 5K miles,

• 
  make sure the air filter is clean

• 
  check the tire pressure and put them on 34 psi when cold

• 
  use Techron fuel injector cleaner every 3K miles

 

[Emry]

Yes I drive mostly highway but even in the city I get great MPG around 27.

 

[Emry]

My tires are factory installed Michelin all season.