Roughness At 40 Mph

[YotaLVR]

Hi, I just got my 2006 RX400h, and if Im driving 40 miles per hour, I feel the car nudge a little and sort of slowly jerk. Is this from an engine cutting on or off or is this some serious problem? Idk if the dealer put in 87 or 91. I love Toyota products and trust them, but I know that every car can have a few problems.

[RX400h]

You may be feeling the ICE (internal combustion engine) kick in and a slight "nudge" is perfectly normal. Personally, I think using regular gas during colder months is less likely to result in a degradation of performance, so don't worry about that. I use mid-grade here in San Diego.

[YotaLVR]

Thanks for the help :)