Argonne National laboratory experimented with 3 cars fitted with stop start (link below)
www.transportation.anl.gov/D3/reports/ANL_APRF_D3_...f
They compared Stop-Start enabled and disabled for the US urban drive cycle for 3 cars: A smart 0.8 petrol , A maxda 3 2.0 petrol, and A gold TDI Blue motion.
In summary they found:
On the US urban cycle the savings were 5, 4, and 2% respectively
On the European cycle, the savings were 14, 8, and 6% respectively.
Sounds good. But they also found that the use of air con far outweighed any Stop-start savings, increasing consumption by a whopping 42, 19 and 21% respectively.
Bear in mind that the test started at a balmy 23C-and not all stop-start systems work when the engine is cold.
Edited by unthrottled on 21/01/2012 at 00:01
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