Hello, my 2007 Lexus IS250 showing I get 13-14 mpg in mixed driving but mostly city driving. I’ve changed my spark plugs to brand new iridium ones but still bad mpg. What you guys think ?

 

Clean the MAF, replace air filter and reset ECU. Then track data at the pump using Trip A distance traveled. Actually try that first!

 

How do I reset the ECU?

 

https://www.clublexus.com/how-tos/a/...our-ecu-363500

Once you put the fuses back in. Turn the ignition just to on. Wait at least 1 minute before you start the car. If you don't the car will stall immediately, and you'll have to start it again. Be warned it will idle high so don't touch the gas pedal at this time. Let it idle until the RPMS stabilize to normal.