Is Premium gas required or can you use regular gas
Typically, you can switch between premium and regular for different preferences of power, fuel mileage, price, etc. You're Lexus is strongly recommended to use premium. If premium is typically 10 cents higher per gallon and you filled up your entire 19 gallon tank you're only looking at $1.90 extra per fill up. To me, $1.90 per week or so is not worth risking performance now and reliability in the long run. Also, remember that premium burns more efficiently so you're mpg's will be slightly higher... this may come close to balancing out the $2 more you'd spend anyways.
When you put the numbers out there to show the difference to fill up, using Premium gasoline is definitely what I prefer. I believe in treating the vehicle well to extend the life of the vehicle. The less maintenance I have to endure, the happier I will be.
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