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840dDieselvsTT 45Petrol
  • MotorwayMotorwayRange and charging
  • PerformancePerformance0-100, top speed
  • ConsumptionConsumptionYearly cost
  • Specs840d · TT 45

BMW 840d xDrive G15 vs Audi TT 45 TFSI: which is cheaper to run?

What each kilometre costs, depending on your driving profile and how you charge. Annual projection and cumulative savings over 10 years.

limousine · 2021 vs 2019 · 15,000 km/an · Mixed · Diesel 2.38 €/L · Petrol 95 2.17 €/L · Methodology
Annual mileage
15,000 km
5,000 km50,000 km
Driving mix

30 % City · 50 % Road · 20 % Motorway

Fuel price
Petrol 95 2.17 €/L · Diesel 2.38 €/Lprix-carburants.gouv.fr — moyenne nationale du 05/10/2026 ; EDF Tarif Bleu Base au 01/08/2026 ; DC autoroute : moyenne des réseaux sans abonnement

Result · yearly energy cost

ABMW 840d xDrive G15

2,170 €per year

6,1 L/100 km weighted · 14.47 € per 100 km · 914 L per year

Gap40 € per yearin favour of the 840d xDrive (−2 %)≈ 19 L petrol 95
BAudi TT 45 TFSI

2,211 €per year

6,8 L/100 km weighted · 14.74 € per 100 km · 1 019 L per year

The verdict changes with your usage
ProfileSplitAA · 840dBB · TT 45Gap
City70 / 25 / 570 % city · 25 % road · 5 % motorway2,427 €2,470 €Nearly level
Mixed30 / 50 / 2030 % city · 50 % road · 20 % motorway2,170 €2,211 €Nearly level
Long-distance10 / 40 / 5010 % city · 40 % road · 50 % motorway1,978 €2,010 €Nearly level

Cumulative saving for the 840d xDrive

1 year
40 €
3 years
121 €
5 years
202 €
10 years
405 €

Energy only. Excludes purchase, insurance, servicing, depreciation.

What produces these figures

WLTP combined
5.8 L/100 km · 6.5 L/100 km
Powertrain
Combustion · Combustion
Power
340 ch · 245 ch
Kerb weight
1,915 kg · 1,330 kg

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Frequently asked questions

On a 100 km mixed trip, the BMW 840d xDrive and Audi TT 45 TFSI have a near-identical cost per km with default parameters. The gap becomes significant once you enter your actual energy prices.

The BMW 840d xDrive is cheaper across all distances with default rates. If your energy prices differ significantly, simulate to see the real impact on your budget.