Restricting the intake will definitly not help your FE. The engine will have to work harder to overcome this restriction. Its not the same as having less dense air.
Also, accelerating slowly is a good entry level driving technique. But, if you want to bring it up to the next level you'll need to change how you accelerate. The most efficient way of accelerating with a manual transmission is keeping rpms low but almost flooring the gas pedal. If you have a scangauge, engine loads of around 80% on average show the best results. This is usually around 1/2 to 3/4 throttle from my experience. I try to keep my rpms between 2000 and 3000, again an average that I have seen work. You can play around with the rpm range and load once you are comfortable with the new technique to see where you get the best mileage from your engine as they'll all be different. Using this technique gets you going fairly quick so you need to be careful not to go too crazy lest you find yourself using the brakes a lot (which negates any benefits you just gained). Try this out and see how it works for you.
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