the only change I have seen in my 04 is a loss of gas milage. I have gone down from 18mpg to 15mpg. So it is now worth the 20 cents more...almost. Also with lower oct gas you run the risk or knocking or build up because it will not burn as hot as the higher octain. I do not suggest you put in an octain booster that can hurt your injectors.
I know this far
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The 2008 Toyota FJ-Cruiser runs on premium unleaded (required).
I just had this problem with my 05 Highlander. $200 later (towing, labor and a $2 part) Turns out it was just a blown fuse. The ETCS 10amp to be exact. I'm not saying this is the reason you're having this problem... I'm just saying check it yourself before you spend the money to have someone else check it for you. Good Luck!
Here is some info on how to test a fuel sending unit: https://www.fillingstation.com/articles/fuelgaugetesting.htm
Here is a video of the process: https://www.youtube.com/watch?v=HJkuEH2aqMU
Europe, south america, north america, africa, asia, oceania, antartica
The first thing we have to know is--what torque? Is it Head bolt torque, rod bolt torque, main cap torque, water bolt torque, or something else? Please specify.
Try looking at the main light on the roof, should have a 3 way switch, one position will be "All OFF', 1 will be "Always ON", 1 will be ON when any door opens.