Stop Start technology claims to save money and save fuel, but does it really?
Here are some calculation which work out if you save money over ten years with Stop-Start
Consumption figures come from this video
Daily cost of engine idling
0.63 litres per hour idling = around 80 Euro cents in gas. 80 cents for an hour of idling.
How long does an engine idle on an average 20 minute commute in a city? 5 minutes (25% of the journey time)?
So 6.6 cents each way, call it 20 cents a day**.
If you start an engine 6 times more with Stop-Start compared to a non Stop-Start engine, does the starter motor last 6 times less?
Assuming it does
Normal starter motor last what? 10 years? At a cost of 100 Euro.
Total cost of gas with non Stop-Start over 10 years = 20 cents * 365 days * 10 years = 730 Euro in idling, + 100 Euro for starter + 50 Euro fitting
GRAND TOTAL 880 Euro
With Stop Start 5 starter motors (because a starter came with the car) * 100 Euro * 250 Euro labour
Grand Total = 750 Euro
Stop Start Savings over ten years
Over ten years maybe a 130 Euro saving, about 13 Euro a year.
**And if we use 15 cents a day as the cost instead of 20 cents, a 25% reduction, the total without Stop-Start comes to
(15 cents * 365 days * 10 years) + 100 Euro starter + 50 Euro fitting
Grand Total = 697 Euro
Non stop start would be 53 Euro cheaper