Road Test: First drive: Citroen C5 Tourer e-HDi 17 June 2010 Last Updated: 29 October 2013 Full Citroën C5 Tourer (08 on) Model Review by Parkers Version Rating: 3 out of 5 Model Rating: 4 out of 5 PSA group to introduce diesel/electric hybrid in revised C5 Stop/start improves fuel economy by 15% for town driving At speeds of less than 13mph car runs in electric mode only Citroën C5 Tourer (08 on) 1.6 e-HDI 16V (115bhp) Airdream VTR 5d EGS6 - Road Test PSA, the company that builds Citroens and Peugeot, is launching a new diesel hybrid powertrain called e-HDi with stop/start technology that promises excellent fuel economy and low emissions. 17 June 2010 Road Test Facts & Figures Equipment Running Costs PSA, the company that builds Citroens and Peugeot, is launching a new diesel hybrid powertrain called e-HDi with stop/start technology that promises excellent fuel economy and low emissions. The new drivetrain will be included firstly in the Citroen C5 and then the C4 and Parker's was granted access to the to the Citroen C5 Tourer diesel/electric hybrid ahead of the revised C5's launch in later this summer. The French company claims this new e-HDi kit will save up to 15% on average in fuel economy when driving in town compared with similar cars without stop/start, but has not yet released official emissions and fuel economy figures. We drove the e-HDi system on the Citroen C5 Tourer. Our car was powered by the 1.6-litre e-HDi unit and it proved to be a very impressive piece of kit, particularly on start-up. Turn the key and you feel no vibrations or rattle that has blighted other stop/start systems. In the city you will see the the real benefits. During our test in Paris we were stationary for around 10 minutes during a 25-minute test - that's 40% of time when no fuel is being burnt, which means considerable fuel savings for urban drivers. The stop/start technology is extremely smooth and when the car does get going it the e-HDi engine feels unflustered and is very refined. So how does it work?When driving the manual version, the car must be in neutral and your foot needs to be off the clutch before the e-HDi system cuts in. When driving under 13mph, the power will be cut from the engine. However, when you want to get underway again dip the clutch, re-engage a gear and the engine starts up nicely - all within 0.4 of a second. The Citroen C5 Tourer e-HDi will go on sale in the UK in October and prices are still to be confirmed.