EPA ratings · 2018 · Lexus · RX
2018 Lexus RX Fuel Economy
EPA rates the 2018 Lexus RX's 6 trims from 21 to 30 MPG combined, RX 350 L AWD to RX 450h AWD. The table below prices every trim per mile at a fuel price and mileage you can change.
EPA ratings by trim
| Trim | Engine | Transmission | Drive | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| RX 350 · Regular | 3.5 L, 6 cyl | Automatic (S8) | Front-Wheel Drive | 20 | 27 | 23 MPG |
| RX 350 AWD · Regular | 3.5 L, 6 cyl | Automatic (S8) | All-Wheel Drive | 19 | 26 | 22 MPG |
| RX 350 L · Regular | 3.5 L, 6 cyl | Automatic (S8) | Front-Wheel Drive | 19 | 26 | 22 MPG |
| RX 350 L AWD · Regular | 3.5 L, 6 cyl | Automatic (S8) | All-Wheel Drive | 18 | 25 | 21 MPG |
| RX 450h AWD · Premium | 3.5 L, 6 cyl, Hybrid | Automatic (AV-S6) | All-Wheel Drive | 31 | 28 | 30 MPG |
| RX 450h L AWD · Premium | 3.5 L, 6 cyl, Hybrid | Automatic (AV-S6) | All-Wheel Drive | 29 | 28 | 29 MPG |
City and highway are EPA's adjusted label figures; combined is the 55/45 blend printed on the window sticker. For electric and plug-in trims the MPG columns are MPGe, and the kWh per 100 miles is the figure a charging cost actually turns on; EPA measures it at the wall, so charging losses are already in it. Unrounded combined figures, where EPA publishes them: RX 350 22.6138; RX 350 AWD 21.8256; RX 350 L 21.9963; RX 350 L AWD 21.2445; RX 450h AWD 29.7729; RX 450h L AWD 29.
What the rating costs per mile
The rating divided by a price, times your miles. It starts at EIA's current U.S. averages and EPA's 15,000 miles so the right-hand column is comparable; type your own pump price, home rate and mileage over them.
| Trim | Runs on | Rated | Per mile | Per year | EPA's figure |
|---|---|---|---|---|---|
| RX 350 | Regular Gasoline | 23 MPG | 18.6¢ | $2,794 | $2,900 |
| RX 350 AWD | Regular Gasoline | 22 MPG | 19.5¢ | $2,921 | $3,050 |
| RX 350 L | Regular Gasoline | 22 MPG | 19.5¢ | $2,921 | $3,050 |
| RX 350 L AWD | Regular Gasoline | 21 MPG | 20.4¢ | $3,060 | $3,200 |
| RX 450h AWD | Premium Gasoline | 30 MPG | 14.3¢ | $2,142 | $2,750 |
| RX 450h L AWD | Premium Gasoline | 29 MPG | 14.8¢ | $2,216 | $2,850 |
Per mile = price ÷ rated MPG (gasoline) or price per kWh × kWh per 100 miles ÷ 100 (electricity). Per year = per mile × miles. EPA's figure is its own annual fuel cost at 15,000 miles, 55% city, and the national price in force when the file was built; it will differ from the middle columns whenever the price here differs. A plug-in hybrid is shown once on each fuel; its real cost sits between them, by how much of its driving is on the battery.
Fuel only — before depreciation, insurance, maintenance or tires, which the True Cost per Mile Calculator adds. Most drivers land below the rating; the True MPG Calculator measures your own from two fill-ups.
EPA's own figures, and why they differ
The “EPA's figure” column is EPA's annual fuel cost from the same file: 15,000 miles, 55% city, and the national fuel price fueleconomy.gov was using on the day the file was built (2026-09-29). fueleconomy.gov recomputes its page every week at the current price, so its number and the file's drift apart between file dates; the middle columns here use a price you can see and change, which is the only honest way to compare two cars. EPA also prints a five-year “you save/spend” against the average new vehicle (spends $1,750 for the RX 450h AWD); it rests on the same assumptions and is not repeated here as a result.
Every figure on this page is a rating, not a measurement of any particular car. The site never calls a rating wrong; it shows what your own price and miles do to it. See the model on fueleconomy.gov.
Other model years of the Lexus RX: 2026, 2025, 2024, 2023, 2022, 2021, 2020, 2019, 2017, 2016, 2015, 2014, 2013, 2012, 2011, 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003, 2002, 2001, 2000, 1999.
Related tools
Price the same miles on gasoline and on electricity, using your fuel price, your utility rate, and each car's rated efficiency.
Open tool →True MPG CalculatorYour car's real fuel economy from two odometer readings and a fill-up — and how far it falls from its EPA rating.
Open tool →Commute Cost CalculatorWhat getting to work costs per day, per month, and per year — energy only, or all-in at the IRS standard mileage rate.
Open tool →Gas Prices by Region and StateThis week's average price of regular gasoline for the U.S., every state and ten cities, from EIA's weekly survey — a dated figure to start from, never one assumed for you.
Open tool →Electricity Prices by StateThe average residential price of electricity in every state, by month, from EIA's utility filings — and what each rate does to a mile in an electric car.
Open tool →Informational only — published averages for scale and comparison, not a quote for any pump, utility or vehicle. Your own price is the one that counts, and every calculator on this site takes it as an input.
Ratings: U.S. EPA and U.S. DOE, fueleconomy.gov vehicles.csv dated 2026-09-29 (EPA record ids 39825, 39828, 39848, 39852, 39829, 39927). Prices: EIA, U.S. regular gasoline week of October 19, 2026; U.S. residential electricity August 2026. Snapshots refreshed monthly.