What is the octane requirement for the 2017 Tacoma V6, what is the purpose of the ECT PWR button and when should it be used? I am trying to hold off unwrapping my owners manual from its sealed package as long as possible. LOL I did some searches and see the recommended octane is 87 but I am only getting 15 mpg all around. I thought going up in octane might help and was curious if using the ECT mode constantly would have a negative effect even though shifting is allegedly better. To date I have not used it at all.