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I coast in neutral as much as possible, usually up to 25% of my commute. I also Pulse and Coast (as I call it) on flat ground or slightly rolling terain. When I can't coast, I just keep the speeds down low enough to not make other drivers too mad. I also accelerate briskly to get torque converter lock asap. When I am coasting, I will re-engage the gear at a speed above torque converter lock, so I can get it locked asap again then pulse and repeat. I just coast as much as is possible. I have found, just thru observation not with any instrumentation, that the pulse and coast for my car is extremely effective at any speed below 60mph. My car will idle at 1000-1100 rpm when coasting in neutral, it's normal idle is 750rpm, my presumption is that the IAC is attempting to rev things up a bit in case I drop it back into gear. Also, a tackometer is vital in rev. matching to coast as much as I attempt to. You can check my fuel log to see the results once I started to coast more and then as I have gained skill at at it.
I also run full synthetic (generic brand) ATF, it didn't seem to make much of a difference to mpg, but I do have trans overheating problems when coasting a lot and having a full grill block, the syn. deffinatly helps relieve those heat related issues.
I also have a trans pan heater to get things warm for the morning, it deffinatly helps get things shifting quicker in the morning.
I also have upped the line pressure in my trans for firmer/quicker shifts. It doesn't seem to have helped mpg any, but it is more reasssuring feeling the shifts.
I'm ready to swap to a manual transmission, the ATX is a big limiting factor for taking my car much further up the mpg charts. I have made a switch box to maually shift my automatic so I can hit gears sooner, but it doesn't have much of a possitive effect on mpg and is difficult to use in traffic. I've tried about all there is I can do with the ATX and have gotten some good results.
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