[Jesse]

I just bought a 2005 Prius with 73k on the odo, it has Nexen CP641 non LRR tires. I have an ecomodded civic si that could get 50mpg with proper driving techniques.

My first tank with the Prius was only 52.5 mpg. No ecomods. I rarely used air conditioning, and stayed under 70mph, usually went 60 to 65. Had some rush hour congestion. My current tank I am only averaging 49.9mpg, staying under 60mph. Think these tires really could be costing me that much mpg? On Priuschat most owners who drive this slow achieve about 55-60mpg easy.

Thanks