Lexus GS — MPG & Fuel Costs 2025
Lexus's sporty executive saloon, combining sharp handling with hybrid efficiency and high build quality.
The Lexus GS is a sporty executive saloon designed to compete with the BMW 5 Series, featuring a rear-wheel-drive layout and high-tech cabin systems.
It is powered by highly advanced self-charging hybrid systems. The 300h is focused on efficiency, while the 450h delivers massive performance.
Real-world fuel economy is strong, with the 300h hybrid averaging 52 MPG under mixed driving cycles.
TL;DR
52 MPG
Real-world petrol
66L
Tank capacity
£90.29
Full tank (petrol)
12.0p
Per mile (petrol)
Real-World Fuel Economy: The Lexus GS achieves an estimated 52 MPG in real-world UK driving conditions, accounting for a 12% WLTP real-world penalty.
Forecourt Fuel Cost: Refueling the 66-litre tank completely costs approximately £90.29 at average UK fuel price rates.
Fuel economy at a glance
52
Real-world MPG
Petrol
64.2
Official WLTP
Petrol
Annual fuel costs by mileage
| Annual mileage | Petrol |
|---|---|
| 5,000 miles/yr | £598 |
| 7,400 miles/yr(UK average) | £885 |
| 10,000 miles/yr | £1196 |
| 15,000 miles/yr | £1794 |
| 20,000 miles/yr | £2392 |
| Full tank (66L) | £90.29 |
| Cost per mile | 12.0p |
Based on UK average fuel prices: petrol 136.8p/L · diesel 142.1p/L. Prices updated regularly.
How does the GS compare?
Tips to get better MPG from your GS
Eco mode optimizes engine and electric motor collaboration to save up to 10% fuel.
Leverage the hybrid system's regenerative capacity by braking early.
Keep speed consistent on motorway journeys using the standard cruise control.
Is the cheaper petrol station worth it?
In a Lexus GS achieving ~52 MPG real-world, if you fill 53 litres and the alternative station is 10p/litre cheaper:
£5.30
Gross saving on fuel
£0.36
Cost of 3-mile detour
£4.94
Net saving ✓
You could drive up to 44 miles round-trip before the saving disappears entirely.
Calculate for your exact situationPopular variants
Frequently asked questions
What is the real-world MPG of the Lexus GS?
The Lexus GS achieves approximately 52 MPG in real-world petrol driving — around 12% lower than the official WLTP figure of 64.2 MPG due to real driving conditions. Diesel variants achieve around N/A MPG real-world.
How much does it cost to fill a Lexus GS?
The Lexus GS has a fuel tank of 66 litres. At the UK average of 136.8p/litre for petrol, a full tank costs approximately £90.29. Diesel costs approximately £93.79 for a full tank.
What is the annual fuel cost for a Lexus GS?
At the UK average annual mileage of 7,400 miles and current petrol price of 136.8p/litre, a Lexus GS costs approximately £885 per year in fuel. At 10,000 miles/year the cost rises to £1196. Actual costs vary with your driving style and mileage.
Is it worth driving to a cheaper petrol station in a Lexus GS?
In a Lexus GS doing ~52 MPG real-world, driving 3 miles round-trip to save 10p/litre on a 53-litre fill nets approximately £4.94 after the extra fuel cost. You could drive up to 44 miles before the saving is eaten up. Use the WorthThePump calculator for your exact situation.
How much does the Lexus GS cost per mile in fuel?
The Lexus GS costs approximately 12.0p per mile in petrol at current UK prices. Over a typical commute of 30 miles per day, that is approximately £3.60 per day in fuel.
What is the WLTP MPG figure for the Lexus GS?
The official WLTP fuel economy figure for the Lexus GS is 64.2 MPG. However, real-world MPG is typically 10–15% lower than WLTP due to cold starts, air conditioning, motorway speeds, and varying loads. WorthThePump uses a 12% real-world penalty to give a more accurate estimate.
Related guides
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