Hello,

I have a 2013 SR5 7 passenger with 15,000 miles (23,000km) on it. I am a retired pro race driver and broke the engine in properly and have kept the service up to date. I always use name brand gas.

I drive 85% Highway and 15% city @ 70 mph and 35 mph respectively. My daily commute is FLAT along a ocean over a large river delta and I do not start fast from the light. (ECO is green 95+% time)

When new 1 year ago I was getting 19 MPG on this type of driving... now I am at 14.6 mpg!!! No 4wd, no snow, no trip into mountains. Toyota service does not want to even look at this.

I have reset the ECU back to factory specs before this last fill up.. and no change.

OOO Wise and long time members (that may work as a toyota tech,) what could go wrong mechanically in this to cause the MPG to drop like that?

Burns not a drop of oil. I am perplexed... could it be a bad O2 sensor???

Looking for more ideas before I present my problems more formally to service.

Thanks for reading and your help.

(The funny thing is that I will most likely do a lift and some other mods that will make the issue worse... but if I am already at 14 MPG where will I end up??? Lambo LM002 territory?)