Not so much these days - Autos generally today have more forward gears than manuals so they can provide that power to the car at lower engine speeds. The AM6 is a six speed Auto box. The current manual boxes fitted to a lot of PSA cars are 6 speed (depending on engine type and size). But some of the new generation of PSA Automatic boxes are 8 speed, so will be more economical.talbotsteve wrote: ↑25 Dec 2018, 22:14 So poor fuel economy is just down to it being a fully automatic gearbox then?
Having said all that, when comparing the 2.0 HDi 138 engines below, one with Manual 6 speed and the other an Auto 6 speed, you can see the Auto fares poorer both in consumption and emissions: These are the official PSA figures for the C5 X7 2008 on for the engines specified.
- | Marketed versions | 2.0 HDi 138 hp BVM (Manual 6 Speed) | 2.0 HDi 138 hp BVA (6 Speed Automatic) |
- | Engines: - gearbox | DW10BTED4 - ML6C | DW10BTED4 - AM6 |
Urban (EEC) | Consumption (L/100km) | 7,9 | 9,9 |
CO2 emissions (in g/100 km) | 209 | 262 | |
Extra urban (EEC) | Consumption (L/100km) | 4,9 | 5,5 |
CO2 emissions (in g/100 km) | 129 | 146 | |
Combined (EEC) | Consumption (L/100km) | 6,0 | 7,1 |
CO2 emissions (in g/100 km) | 157 | 189 |