What type of fuel should I use in my Toyota Highlander?

I recently purchased a Toyota Highlander and I'm unsure about what type of fuel to use. The manual says regular unleaded, but would using premium unleaded improve the performance or gas mileage? Any advice would be appreciated.

As a Toyota mechanic with over 10 years of experience, I can confidently say that using regular unleaded fuel is the best option for your Highlander. Premium unleaded may provide a slight improvement in performance, but it's not worth the extra cost.

I have been using premium unleaded in my Toyota Highlander for the past year and have noticed a significant improvement in gas mileage. However, it ultimately depends on your individual driving habits and if you're willing to pay the extra cost for the fuel.

I recently switched to premium unleaded in my Toyota Highlander and have noticed smoother acceleration and better overall performance. I highly recommend giving it a try and seeing if you notice a difference.