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So I have an update. I started using the DashCommand iPhone app so I get some data.
I have been looking at the gph while in neutral and while coasting downhill in 6th gear. The RPM's and gph remain the same weather in neutral or coasting downhill in 6th gear. Approx 1,100 rpm = .9gph (this is at 45 mph). So there is no savings in gph between coasting in gear or shifting to neutral.
My base idle at 600 rpm is .3 gph. So my ECU is nearly doubling my rpm and tripling my gph while I coast downhill at 45 mph (no foot on throttle). Tripling my gph is significant when it is not necessary. Older cars used to get better mpg than autos. Now the opposite is true. Part of the new inefficiency is our car's ECU not allowing our engines idle when we are coasting in neutral or gear.
What I did not know is if someone was able to link their laptop to a Toyota ECU and make a simple mod to reprogram this high idle. A friend of mine does some high end car tunes. He says Toyota's ECU's are really locked down for mods.
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