At an early stage of the project, the search for optimal environmental efficiency was a major priority, especially as the vehicle was a crossover.

Particular attention was paid to the car's aerodynamics (Cx of only 0.296), weight optimisation (lightweight materials, laser welding, etc) and Michelin tyres with a low rolling resistance (derived from the Peugeot 308) are fitted to most versions.

At the heart of the Peugeot 3008's eco-efficiency, its six power trains feature the most advanced technologies in the market segment, both for petrol (with the 1.6 litre VTi and THP engines developed in co-operation with the BMW Group) and diesel versions (1.6 and 2.0 litre HDi fitted with a diesel particulate emission filter). Fuel consumption on the most eco-friendly version is therefore reduced to only 4.9 litres/100 km or 130 g/km of CO2.

In 2009, the Peugeot 3008 range will be as follows:

HDi FAP diesel:
1.6 litre HDi FAP 80 kW (110 bhp), 240 Nm, 6-speed manual gearbox - CO2: 137 g/km
1.6 litre HDi FAP 80 kW (110 bhp), 240 Nm, 6-speed electronically-controlled manual gearbox - CO2: 130 g/km
2.0 litre HDi FAP 110 kW (150 bhp), 340 Nm, 6-speed manual gearbox - Euro 5, CO2: 146 g/km
2.0 litre HDi FAP 120 kW (163 bhp), 340 Nm, 6-speed automatic gearbox - Euro 5, CO2: 176 g/km
Petrol:
1.6 litre VTi 88 kW (120 bhp), 160 Nm, 5-speed manual gearbox - Euro 5, CO2: 165 g/km
1.6 litre THP 110 kW (150 bhp), 240 Nm, 6-speed manual gearbox - CO2: 176 g/km, and the 1.6 litre
THP 115 kW (156 bhp), 240 Nm, 6-speed manual gearbox - Euro 5, CO2: 170 g/km

Finally, from 2011, the Peugeot 3008 will be the first vehicle in the PSA Peugeot Citroën Group to benefit from HYbrid4 technology, as unveiled on the Prologue HYbrid4 concept car at the 2008 Paris Motor Show. This technology, representing a real breakthrough in terms of fuel consumption and CO2 emissions (in the order of a 35% reduction), it also allows four wheel drive thanks to front wheel drive provided by the HDi FAP diesel engine and rear wheel drive provided by an electric motor. The latter also allows an "all electric" drive mode, i.e. with zero emissions.