Premium Fuel for Hybrid Lexus, Regular for Hybrid Toyota.
Why does the 450H state that it requires premium fuel, while a hybrid highlander does not. Both have 3.5L.

To realize that luxury can also be efficient and practical, just have a look at the 2015 Lexus RX 450h. This 5-passenger elocution of elegance packs a ton of posh onto its hybrid-powered frame, as well as several new amenities, some hefty mileage numbers and over 80 cubic feet of total cargo space.
A few added tweaks for 2015, meantime, start with the inclusion of the 7-inch Audio Display with a rear-view camera as standard equipment, while improvements to the Remote Touch infotainment control are an obvious response to negative reviews concerning its previously unfriendly user dynamics. Additionally, upsized and upgraded wheels have been added to the available Premium Package, and new LED fog lights are now available with the optional LED and high-intensity-discharge (HID) headlights that debuted in 2011.
Returning with a single base trim again for 2015, the RX 450h is offered in the less expensive front-wheel-drive (FWD) configuration and in weather-wrestling all-wheel drive (AWD) garb. Both sub-trims pack a 3.5-liter hybrid V6 powerplant that mates with the standard continuously variable transmission (CVT) and a pair of 116-kilowatt electric motors for 295 total horsepower. In a further concession to personal panache, this midsize crossover ute totes 4 driver-selectable modes—Normal, EV, Eco and Sport—to suit the conditions and green-leaning tendencies of a particular journey. Mileage numbers, meantime, are expected to remain 32 mpg city/28 highway in FWD editions and 30/28 in AWD versions, while towing capabilities are maxed out at 3,500 pounds with the proper equipment.
Expected appearance features and creature comforts, in addition to those new accoutrements introduced for 2015, include 18-inch alloy wheels, a rear spoiler, a power liftgate, heated power-adjustable mirrors, trailer wiring, cloth upholstery, power-adjustable front seats, full power accessories and wood, alloy and leather cabin accents. Further standard plush is added with reclining rear seats, cruise control, telescoping tilt-wheel steering, dual-zone climate control and a remote garage-door opener.
Meanwhile Lexus’ own Bluetooth-integrated “enform” emergency assistance and Safety Connect system returns for 2015 as standard equipment, as does a 6-CD player with 9 speakers, satellite radio and auxiliary iPod integration.
Optional equipment on top of those introductory items already mentioned include a Premium package with leather upholstery a power sunroof, power-folding mirrors and memory for driver's settings, while the Comfort Package with HID headlights, heated front seats and automatic wipers also returns for this year.
The newly upgraded Audio Display can now be enhanced with an available navigation package and 8-inch touchscreen display, while the Luxury Package boasts brand new 19-inch 5-spoke wheels in an attractive gray machined finish, as well as a heated steering wheel and upgraded leather upholstery.
Standard safety features, finally, are slated to include 4-wheel antilock brakes (ABS), traction and stability control, front and rear head airbags, front and rear side-mounted airbags, and active front headrests. Daytime running lights, front fog/driving lights, turn-signal-integrated mirrors and a remote antitheft alarm also should return for 2015, bolstered by available high-intensity-discharge (HID) and LED headlights. A post-collision safety system, meantime, should once more be standard, complemented by optional adaptive cruise control with emergency braking and lane-departure warnings, while a glass-breakage sensor is again available as an option.
Why does the 450H state that it requires premium fuel, while a hybrid highlander does not. Both have 3.5L.
Air Conditioning
Automatic climate control front air conditioning · Dual front air conditioning zones
Airbags
Dual front airbags · Dual front knee airbags · Passenger airbag deactivation: occupant sensing deactivation · Rear side airbags · Front side curtain airbags
Audio System
Antenna Type: diversity · Auxiliary audio input: jack · Single disc in-Dash CD · MP3 player: CD MP3 Playback · AM/FM radio · Satellite Radio: SiriusXM · Total Number of Speakers: 12
Brakes
ABS: 4-wheel · Braking assist: hill start assist · Front brake diameter: 12.9 · Front brakes: ventilated disc · Rear brake diameter: 12.2 · Rear brakes: disc
Comfort Features
Armrests: rear center with cupholders · Floor Mat Material: carpet · Floor Material: carpet · Floor Mats: front · Shift knob trim: leather · Steering wheel trim: leather
Convenience Features
Assist handle: rear · Cargo area power outlet: 12V · Cargo cover: retractable · Center console: front console with armrest and storage · Cupholders: rear · Dimming rearview mirror: auto-dimming · Easy entry: power driver seat · Multi-function remote: proximity entry system · One-touch windows: 4 · Power outlet(s): 12V front · Power windows: lockout button · Reading lights: rear · Rear power outlet: 12V · Steering wheel: power tilt and telescopic · Steering wheel mounted controls: cruise controls · Storage: accessory hook · Universal garage door opener: Homelink · Vanity mirrors: dual illuminating
Driver Seat
Adjustable lumbar support: power · Power adjustments: 10
Drivetrain
Axle ratio: 3.54
Engine
Electric Motor Battery Type: nickel-metal hydride · Electric Motor HP: 165 · Electric Motor Power Output (Kilowatts): 123 · Electric Motor Torque: 247 · Hybrid Gas Engine HP: 245 · Hybrid Gas Engine HP@RPM: 6000 · Hybrid Gas Engine Torque: 234 · Hybrid gas Engine Torque@RPM: 4800
Exterior Features
Door handle color: body-color · Front bumper color: body-color · Grille color: chrome surround · Mirror color: body-color · Rear bumper color: body-color · Rear spoiler: roofline spoiler · Rear spoiler color: body-color · Rear trunk/liftgate: power operated · Window trim: chrome
Headrests
Front headrests: adjustable · Number of front headrests: 2 · Number of rear headrests: 3
Hybrid
Starter Type: motor/generator
In Car Entertainment
Infotainment screen size: 7 in.
Instrumentation
Fuel economy display: MPG · Warnings and reminders: maintenance reminder
Lights
Daytime running lights: LED · Exterior entry lights: security approach lamps · Headlights: Halogen · Tail and brake lights: LED
Mirrors
Exterior mirrors: manual folding
Passenger Seat
Adjustable lumbar support: power · Power adjustments: 10
Rear Seats
Type: 40-20-40 split bench
Safety
Active head restraints: driver · Camera system: rearview · Child seat anchors: LATCH system · Crumple zones: rear · Rearview monitor: in dash
Seatbelts
Emergency locking retractors: front and rear · Front seatbelts: 3-point · Seatbelt force limiters: front and rear · Seatbelt pretensioners: front and rear · Seatbelt warning sensor: driver and passenger · Second row seatbelts: 3-point
Seats
Driver seat power adjustments: height · Front seat type: bucket · Passenger seat power adjustments: height · Rear headrests: adjustable · Rear seat folding: flat · Rear seat manual adjustments: reclining · Upholstery: cloth
Security
Power door locks: anti-lockout
Spare Tire
Mount Location: inside · Size: temporary
Spare Wheel
Rim Type: steel
Steering
Steering ratio: 14.8 · Turns lock-to-lock: 2.8
Suspension
Front Arm Type: lower control arms · Front Shock Type: gas shock absorbers · Front Spring Type: coil springs · Front Suspension Classification: independent · Front Suspension Type: MacPherson struts · Rear Shock Type: gas shock absorbers · Rear Spring Type: coil springs · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): front
Telematics
Phone: hands free · Phone wireless data link: Bluetooth
Tires
Type: all season
Tires and Rims
Wheel type: aluminum alloy
Wheels
Wheel spokes: 5
Windows
Front wipers: variable intermittent · Laminated glass: acoustic · Liftgate window: fixed · Power windows: with safety reverse · Rear wiper: with washer
Air Conditioning
Automatic climate control front air conditioning · Dual front air conditioning zones
Airbags
Dual front airbags · Dual front knee airbags · Passenger airbag deactivation: occupant sensing deactivation · Rear side airbags · Rear side curtain airbags
Audio System
Antenna Type: mast · Auxiliary audio input: iPod/iPhone integration · Single disc in-Dash CD · MP3 player: CD MP3 Playback · HD radio · Satellite Radio: SiriusXM · Total Number of Speakers: 12
Brakes
ABS: 4-wheel · Braking assist: hill start assist · Front brake diameter: 12.9 · Front brakes: ventilated disc · Rear brake diameter: 12.2 · Rear brakes: disc
Comfort Features
Armrests: rear center with cupholders · Floor Mat Material: carpet · Floor Material: carpet · Floor Mats: front · Shift knob trim: leather · Steering wheel trim: leather
Convenience Features
Assist handle: rear · Cargo area power outlet: 12V · Cargo cover: retractable · Center console: front console with armrest and storage · Cupholders: front · Dimming rearview mirror: auto-dimming · Easy entry: power driver seat · Multi-function remote: proximity entry system · One-touch windows: 4 · Power outlet(s): 12V front · Power windows: lockout button · Reading lights: rear · Rear power outlet: 12V · Steering wheel: power tilt and telescopic · Steering wheel mounted controls: audio · Storage: door pockets · Universal garage door opener: Homelink · Vanity mirrors: dual illuminating
Driver Seat
Adjustable lumbar support: power · Power adjustments: 10
Drivetrain
4WD Type: on demand · Axle ratio: 3.54
Engine
Electric Motor Battery Type: nickel-metal hydride · Electric Motor HP: 165 · Electric Motor Power Output (Kilowatts): 123 · Electric Motor Torque: 247 · Hybrid Gas Engine HP: 245 · Hybrid Gas Engine HP@RPM: 6000 · Hybrid Gas Engine Torque: 234 · Hybrid gas Engine Torque@RPM: 4800
Exterior Features
Door handle color: body-color · Front bumper color: body-color · Grille color: chrome surround · Mirror color: body-color · Rear bumper color: body-color · Rear spoiler: roofline spoiler · Rear spoiler color: body-color · Rear trunk/liftgate: liftgate · Window trim: chrome
Headrests
Front headrests: adjustable · Number of front headrests: 2 · Number of rear headrests: 3
Hybrid
Starter Type: motor/generator
In Car Entertainment
Infotainment screen size: 7 in.
Instrumentation
Fuel economy display: MPG · Warnings and reminders: maintenance reminder
Lights
Daytime running lights: LED · Exterior entry lights: security approach lamps · Headlights: Auto on/off · Tail and brake lights: LED
Mirrors
Exterior mirrors: integrated turn signals
Passenger Seat
Adjustable lumbar support: power · Power adjustments: 10
Rear Seats
Type: 40-20-40 split bench
Safety
Active head restraints: driver · Camera system: rearview · Child seat anchors: LATCH system · Crumple zones: rear · Rearview monitor: in dash
Seatbelts
Emergency locking retractors: front and rear · Front seatbelts: 3-point · Seatbelt force limiters: front · Seatbelt pretensioners: front · Seatbelt warning sensor: driver and passenger · Second row seatbelts: 3-point
Seats
Driver seat power adjustments: reclining · Front seat type: bucket · Passenger seat power adjustments: reclining · Rear headrests: adjustable · Rear seat folding: flat · Rear seat manual adjustments: reclining · Upholstery: cloth
Security
Power door locks: anti-lockout
Spare Tire
Mount Location: inside · Size: temporary
Spare Wheel
Rim Type: steel
Steering
Steering ratio: 14.8 · Turns lock-to-lock: 2.8
Suspension
Front Arm Type: lower control arms · Front Shock Type: gas shock absorbers · Front Spring Type: coil springs · Front Suspension Classification: independent · Front Suspension Type: MacPherson struts · Rear Shock Type: gas shock absorbers · Rear Spring Type: coil springs · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): front
Telematics
Phone: hands free · Phone wireless data link: Bluetooth
Tires
Type: all season
Tires and Rims
Wheel type: aluminum alloy
Wheels
Wheel spokes: 5
Windows
Front wipers: variable intermittent · Laminated glass: acoustic · Liftgate window: fixed · Power windows: with safety reverse · Rear wiper: with washer