It is not good to constantly start and shut off your engine while Idleing. Sitting at a red light for 30 seconds will not hurt fuel economy that much. And it will wear your battery and starter out much quicker. Only do it if your sitting in traffic for 10+ minutes. And not all manuals get better gas mileage than automatics. New honda’s have vcm(variable cylinder management) which allows the computer to shut off cylinders while slow city driving. So a v6 Honda will be only using 4 cylinders. Increasing gas mileage by sometimes up to 3-5 miles a gallon. Vehicles will be using all 6 cylinder during most highway trips. So the automatics actually get better fuel economy than the manuals, but not by much(a little is better than nothing).
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