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The Defender OCTA is an exceptionally powerful, heavy performance SUV, so fuel is a major part of its operating budget. There is no single “OCTA mpg” number that applies everywhere: Land Rover’s certified result, US EPA data and independent road tests use different markets, tyres, routes and test methods. Use the figure that matches your country and driving, then calculate fuel spend from your own mileage and pump price.
The most defensible way to plan ownership is to treat published economy as a starting point, not a promise. Certified figures are useful for comparing vehicles within the same test system; a documented road test is a reality check; your own full-tank records are the only dependable basis for a personal budget.
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Defender OCTA fuel-economy figures at a glance
The table separates the numbers by market and measurement type. They should not be averaged together or ranked as though they came from one laboratory cycle.
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Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →| Source and vehicle context | Market or test | Fuel-economy result | What the number means |
|---|---|---|---|
| Land Rover Germany, Defender 110 OCTA P635 (4.4-litre V8 mild hybrid) | German-market combined certification | 13.8 l/100 km; 313 g/km CO₂ | Manufacturer figure for the specified German-market model. It is not an owner guarantee. |
| Car and Driver, 2025 US-market test vehicle | US EPA rating and observed road test | 17 mpg combined, 15 city, 19 highway EPA; 15 mpg observed | US gallons and US test conditions. The test car used 22-inch wheels and Michelin Primacy All Season tyres. |
| Autocar, 2026 review | Touring road test | 21.0 mpg WLTP; 22.1 mpg observed on tour | Independent touring result. The publication used the observed figure to estimate range from a 90-litre tank. |
Land Rover Germany lists the same 13.8 l/100 km combined value for the OCTA P540 as well as the P635 on the page checked in 2026. Local equipment, homologation and model-year details can differ, so confirm the specification shown for the vehicle you are buying.
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What Land Rover’s official figures actually tell you
German-market WLTP result
The German specification page identifies the 110 OCTA P635 as a 4.4-litre V8 mild hybrid and gives 13.8 l/100 km combined consumption with 313 g/km CO₂. That is a WLTP-style manufacturer result for Germany. It is useful for a like-for-like comparison with other vehicles tested under the same system, but it does not describe every journey an owner will make.
UK figures and the manufacturer’s warning
On its UK Defender OCTA specifications page, Land Rover directs readers to WLTP data, labels the displayed economy as GB figures and notes that Northern Ireland figures may vary. The page lists driving style, environmental conditions, vehicle load, wheel fitment, accessories and the actual route as variables. It also states that its results are manufacturer test figures for comparison and that “Real world figures may differ.”
That qualification matters particularly for the OCTA. A large V8-powered vehicle can spend long periods under high aerodynamic and tyre loads, and the same vehicle can show very different consumption on a steady motorway run and in short urban trips. The official number should therefore anchor your comparison, not serve as a promised dashboard average.
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Car and Driver: a US EPA baseline and 15 mpg observed
Car and Driver’s review, published April 3, 2026, covers a 2025 US-market Defender Octa. The EPA ratings are 17 mpg combined, 15 mpg city and 19 mpg highway. During the publication’s own test, the vehicle returned 15 mpg. The test car had 22-inch wheels and Michelin Primacy All Season tyres, details that make the result specific to that configuration rather than a universal OCTA average.
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EPA mpg is based on US gallons and a US certification procedure. It should not be converted into a European WLTP result and placed beside 13.8 l/100 km without explaining the different units and cycles. The observed 15 mpg is valuable because it shows what one publication recorded on the road, but it remains one test vehicle on one route and in one set of conditions.
Autocar: touring economy and an illustrative range
Autocar’s 2026 review reports a 90-litre fuel tank, a 21.0 mpg WLTP figure and 22.1 mpg on its touring test. Using the touring result and the stated tank size, the reviewer estimates 438 miles of range. That 438-mile figure is a test-based calculation, not a guaranteed distance for every full tank.
Autocar’s linked review should be read in its own market and unit context. Actual range changes with speed, traffic, weather, load, wheel and tyre specification, route profile and how much fuel the driver is willing to use before refuelling. A nominal tank capacity can also differ from the amount a driver regards as usable once reserve practice and the fuel gauge are taken into account.
How much range can you expect from a full tank?
The OCTA’s reported 90-litre tank gives a useful framework, but the answer depends on realised consumption. The following calculations are illustrations, not additional factory claims.
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| Consumption basis | Arithmetic using a 90-litre nominal tank | Illustrative distance | Important limitation |
|---|---|---|---|
| 13.8 l/100 km German combined figure | 90 ÷ 13.8 × 100 | About 652 km (405 miles) | Pure arithmetic assuming the full nominal volume and no reserve or driving variation. |
| 15 mpg observed by Car and Driver (US mpg) | 90 litres ÷ 3.785 litres per US gallon × 15 | About 357 miles | Combines a US road-test result with a nominal tank; it is not a forecast for every owner. |
| 22.1 mpg touring result reported by Autocar | Autocar’s calculation using its touring result and 90-litre tank | 438 miles | Publication-specific estimate; conditions and usable fuel affect the result. |
The apparent spread is not a contradiction. The first calculation uses a certified litres-per-100-kilometres value, the second uses a US road-test mpg result, and the third uses Autocar’s touring result and assumptions. They answer different questions. For trip planning, leave a margin for congestion, detours, weather and the point at which you choose to refuel rather than plan to empty the tank.
Why your OCTA’s economy may be higher or lower
Driving style and route
Repeated acceleration, high cruising speeds, stop-start traffic and short journeys generally use more fuel than a smooth, steady trip. A touring result can therefore look much better than an urban commute even when both are driven in the same vehicle. Compare your own records by route type instead of expecting one blended number to describe every day.
Wheels, tyres and accessories
Land Rover specifically identifies wheel fitment and accessories as factors that can alter economy. Car and Driver’s 15 mpg observation came from a vehicle on 22-inch wheels with Michelin Primacy All Season tyres; another wheel-and-tyre combination may not reproduce that result. Roof-mounted equipment, added exterior accessories and heavy cargo also change the conditions under which the engine has to work.
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Weather, terrain and load
Temperature, wind, elevation changes, wet roads and the mass carried in the vehicle all influence consumption. These variables are why a certified figure cannot be used as a guaranteed range and why a single road test should be treated as a reference point rather than a promise.
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Calculate your annual fuel bill
Fuel cost is personal: you need annual distance, a measured consumption figure and the price in the currency and unit used at your pumps. Keep those inputs together so the result is auditable.
For litres and kilometres
- Record your expected annual distance in kilometres.
- Choose a realistic consumption value in litres per 100 kilometres. For a planning range, you might model the German certified 13.8 l/100 km separately from your own observed average once you have enough tank records.
- Calculate annual litres with: annual kilometres × consumption in l/100 km ÷ 100.
- Multiply annual litres by your local price per litre.
For example, using an explicitly hypothetical 15,000 km per year and €1.80 per litre, 13.8 l/100 km produces 2,070 litres and €3,726 in fuel. Those distance and price assumptions are examples only; they are not a current price or a forecast for your country.
| Annual distance | At 13.8 l/100 km | Illustrative fuel spend at €1.80/litre |
|---|---|---|
| 10,000 km | 1,380 litres | €2,484 |
| 15,000 km | 2,070 litres | €3,726 |
| 20,000 km | 2,760 litres | €4,968 |
For US miles and gallons
- Estimate annual miles.
- Divide miles by your realised US mpg to obtain annual US gallons.
- Multiply gallons by your local price per US gallon.
As a worked example, 12,000 miles at the 15 mpg observed by Car and Driver would be 800 US gallons. At a hypothetical $3.50 per gallon, that is $2,800. Replace both the mileage and price with your own figures; the example is not a national average.
Measure your own real-world MPG accurately
- Fill the tank to the same practical stopping point and record the odometer or trip distance.
- Drive normally, noting whether the tank was mostly city, highway, touring or mixed use and whether the vehicle carried unusual cargo.
- Refuel and record the litres or gallons added, the distance travelled and the amount paid.
- For metric units, calculate litres ÷ kilometres × 100. For US units, calculate miles ÷ US gallons.
- Repeat across several tanks before changing your budget. One fill can be distorted by a different pump shut-off point, a steep route, unusual weather or a short trip.
Keep wheel and tyre changes, accessories and seasonal conditions in your notes. That makes it easier to identify a genuine change rather than attributing every difference to the engine.
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Fuel is only one part of OCTA running costs
No universal annual ownership total can be stated from the available specifications. Insurance premiums, registration or circulation tax, maintenance pricing, tyre replacement, financing and local fuel prices depend on country, driver, mileage, vehicle configuration and provider. The 313 g/km CO₂ figure may be relevant to tax in some jurisdictions, but each authority applies its own rules and bands.
Build a personal budget with separate lines for fuel, scheduled servicing, tyres, insurance, tax and an allowance for unscheduled repairs. Use your measured fuel consumption after the first months of driving and update the calculation when your annual mileage or local price changes. Keeping fuel separate from fixed ownership costs prevents a temporary pump-price change from being mistaken for a mechanical problem.
Which figure should you use?
- Use 13.8 l/100 km and 313 g/km CO₂ when you need the published German-market specification for the 110 OCTA P635 or P540, while recognising that homologation and equipment can vary elsewhere.
- Use the EPA 17/15/19 mpg figures when comparing US-market vehicles under the US system, and regard the 15 mpg observation as a single documented road test.
- Use Autocar’s 22.1 mpg touring result and 438-mile estimate as an example of long-distance performance under that review’s conditions, not as a guaranteed tank range.
- For a purchase decision, calculate two budgets: a conservative scenario based on your likely mixed-use result and a lower-cost scenario based on steady touring. Update both with your own tank records.
The practical verdict is straightforward: the Defender OCTA can deliver respectable touring economy for its performance, but its high fuel demand makes distance, route and local fuel price decisive. Treat every published number as context-specific, leave a reserve in range planning and let your own refill log determine what ownership actually costs.
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