The tricks up my sleeve... Methods I may implement for better FE.

[Wyldesoul]

For the times that you need it, such as merging on a rather fast highway.

Same logic could be said as to why don't you switch to a really really tiny throttle body if you don't really ever use WOT on your car. It's good to have power there in case you need it.

In going for FE, you are always as easy on the gas petal as you can be, and in those conditions, with a turbo, you never engage it. Only if you push down hard on the petal does the turbo ever engage. Heck, I only use my turbo maybe once or twice a day or so. I've gone up to a week without seeing any boost on my car.

So I can easily shut off the engine in a long coast, just so long as I haven't boosted in the past few minutes.

Turbos are not used nearly as much as most think. The "disadvantage" of the lag is actually quite the advantage if you're going for FE. Means that if you mash the throttle there's a second or so of hesitation before the turbo spools up and boosts. In that second, you have the chance to let off the throttle and make sure that no boost (extra fuel included) is engaged. You can accelerate rather well without ever using the turbo. (In my car, at least, but it's a 2.3, a rather big block for a 4 banger)

My main point is, a turbo only engages when you want the power. If you are easy on the car, the turbo is not used. It's just there in case you need the power for an "emergency"