What is the fuel consumption of a 1999 Lexus LS400?
The 1999 Lexus LS400 typically achieves about 16 mpg in city driving and 23 mpg on the highway, for roughly 19 mpg combined.
The question concerns the fuel consumption of a late-1990s LS400, a full-size luxury sedan powered by Lexus's 4.0-liter 1UZ-FE V8 and paired with a four-speed automatic. This article outlines the official EPA figures for that model year and what drivers generally experience in everyday use.
Official EPA figures
Before listing numbers, note that the Environmental Protection Agency provides standard fuel economy estimates for the 1999 LS400. These figures serve as a baseline for comparing the vehicle's efficiency within its era and class.
- City: 16 mpg
- Highway: 23 mpg
- Combined: 19 mpg
Keep in mind that these numbers reflect testing conditions from the era and assume typical maintenance and tires. Real-world results can vary based on driving style, terrain, and vehicle condition.
Real-world performance
In daily use, owners often observe mileage in the high teens to around 20 mpg, influenced by factors such as urban versus highway driving, traffic, and how well the car has been maintained. The LS400’s weight and smooth V8 character tend to favor refinement and performance over peak fuel economy.
Factors that influence fuel economy
Several variables affect actual fuel consumption for the 1999 LS400, including engine wear, tire type and pressure, climate-control usage, driving style, and payload. The combination of a 4.0-liter V8, four-speed automatic, and the car’s weight all play into the real-world numbers you’ll see.
Tips to maximize efficiency
To optimize mileage on this older luxury sedan, ensure regular maintenance (air filter, spark plugs, oxygen sensors), keep tires properly inflated, use the recommended oil viscosity, and practice smooth acceleration and braking. Reducing unnecessary weight and minimizing aggressive start-stop driving can also help approach the EPA figures where possible.
Summary
The 1999 Lexus LS400 carries EPA estimates of 16 mpg city, 23 mpg highway, and 19 mpg combined. Real-world figures typically fall in the high teens to around 20 mpg, depending on driving conditions and vehicle upkeep. For a luxury sedan of its era and class, these figures reflect a balance between comfort, performance, and efficiency.
What is the gas mileage of a 1999 LS400?
Fuel & MPG
| EPA combined MPG | 19 MPG |
|---|---|
| Range in miles (city/hwy) | 360.0/517.5 mi. |
| Fuel tank capacity | 22.5 gal. |
| CO2 Emissions | 7.7 tons |
How long will a 1999 Lexus LS400 last?
With proper maintenance, the LS400 will go 400,000 miles without a problem.
How many miles per gallon does a Lexus LS400 get?
The Lexus LS400's MPG varies by model year, but generally averages around 18-19 MPG combined (17-18 MPG city, 21-23 MPG highway). For example, a 1999 model has a combined rating of 19 MPG with 16 MPG city and 23 MPG highway. Actual mileage will depend on driving habits, as aggressive driving can lower the MPG, while steady highway driving can increase it.
You can watch this video to learn about the real-world driving experience and gas mileage of a Lexus LS400: 55sCar Adventures With RegYouTube · Feb 25, 2024
- 1999 LS400: 19 MPG combined (16 city / 23 highway)
- 1997 LS400: 19 MPG combined (17 city / 23 highway)
- 1995 LS400: 19 MPG combined (17 city / 23 highway)
- 1992 LS400: 18 MPG combined (16 city / 21 highway)
- 1991 LS400: 18 MPG combined
How big is the LS400 full tank range?
380.8/537.6 mi. 22.4 gal.
