There's a growing rumor that the last Engine Control Unit program update has caused the engine to operate more frequently, thus lowering the miles per gallon. I thought I had lost some miles per gallon to the hot weather until I heard this. Anyone have any support for this?
Note to Toyota, I bought this vehicle because it looked like a good technological compromise to achieve higher mileage. You've released the Hybrid Highlander, the GX400h, and the Hybrid Camry with minuscule improvements in the mpg versus their gasoline only counterparts. I think you're missing a significant market if this rumor is true and you continue releasing vehicles with only minor mileage improvements.