That is incorrect about VVT motors, the point to variable valve timing is you get increased performance with higher octane rated gas. Filling up with 93 will not burn your injectors with VVT. The reason many had this info was, putting 93 in a motor that has no ability to adjust timing and spark was near useless. Most stock motors are set up for economy, this means the timing is set to optimize low grade gas and not knock or ping. Using fuel higher than 93 is not recommended, GM and Toyota VVT motors suggest 93 in the owners manual for better performance. 43K on my last truck with VVT and nothing but 93 in the tank, with not even a foul O2 sensor.