I do this also. Whenever I get stuck at a long light, I know I just missed. The engine goes off and I start again when I see the other light turn red(b/c engine starts so quickly). I am still gauging whether I am burning more gas on the restart. One downside is during the summer when it is hot, the AC goes off also with the engine. First car I saw do this. At least the blower stays on in other cars without the compressor running.
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The 2007 Saturn Vue Hybrid I had for 5+ years and 75,000 miles acheived more than half of it's fuel savings via stop-start technology. The system work well enough (for a 1st generation system). The engine started seemlessly within half a second or less of when you took your foot off the brake. There were a couple times when the hybrid system malfunctioned where instead of starting via the generator system (which was a relatively quiet, smooth start), it started using the main engine starter, but it never failed to start.
As far as A/C control, the Vue Hybrid had a driver control that simply allowed you to override the stop-start system if you wanted the AC compressor to stay on, otherwise the engine would stop for up to two minutes at a time, but the fan, radio, lights, and electric steering all stayed functional while the engine was off. They system would restart the engine in not more than two minutes even if you didn't take your foot of the brake.
2012 Cruze LTZ RS
2012 ECO MT - Black Granite/Cloth; 814 mile range; Bluetooth Stereo AUX; OEM Fogs w/Chrome Covers; GM Spare tire; VG Shark Fin
2010 Mit Lancer GT MT (traded for ECO @31K miles)
2002 Pont Montana AWD (traded for 2012 LS @182K miles)
1990 Pont Transport (traded for Montana @240K miles)
1986 Fiero GT MT (traded for Transport - needed more seats)
1985 Fiero 2M4 MT (traded for Fiero GT @8K miles)
The Opel Astra J 1.4T (current model) which shares the same or very similar engine to our cruzes has stop/start as standard on both manual and auto.
Last edited by chrissn89; 11-19-2012 at 02:22 AM.