I suspected that might be true about the gas but the car should not stutter at all. I don't think how often the car stops and starts is it. Here's how it works:
1 The 60+ hp starter motor spins the ICE up to about 1000 rpm in about a 1/4 second when computer calls for the ICE.
2 The spark is turned on
3 Throttle is opened, fuel injection is ramped up as the starter energy and traction motor energy is ramped down.
When the computer calls for the ICE to stop:
4 The fuel injection is ramped down as the traction motor energy is ramped up
5 When the injectors are off, the throttle is kept open for a brief period with the ignition still on and the starter motor keeps the ICE at about 1000 rpm very briefly to purge the intake manifold of air/fuel charge. The throttle closes and the starter motor then stops and the ICE rapidly goes to 0 rpm. Below 1000 rpm there is never any fuel, ignition or much air in the cylinders as the throttle is closed.
This is all for emissions and smooth running. The ICE never has combustion below about 1000 rpm for smoothness. When the ICE is started again, the intake manifold is clear and the very first amount of fuel injected produces low emissions combustion. There is almost never any fuel that is not burned stoichiometrically ( chemically perfectly ) during running, starting and stopping.
You never hear the ICE "cranking" or going through compression strokes without firing like you do in a non-hybrid.
The big difference is the Atkinson ICE closes the intake valve latter in the compression stroke and a lot of fuel/air charge is blown back into the intake manifold. It tends to get the throttle body dirtier quicker. They can be cleaned or replaced.
Edited by lolder, 09 December 2017 - 12:32 AM.