You take it wrong, unless you drive at WOT all the time. :/
The throttle at anything less than WOT restricts air flow, because it has to, or else you'd have a runaway engine.
If you are driving for economy you aren't at WOT in the first place.
The only thing you will notice upon removal of the cone- or most any intake alteration- is more noise.
If you don't believe it, and it is an easily removeable/replaceable part, go ahead and test it. Search for the very helpful "conducting a proper a-b-a test" thread on this site.
I don't know why you feel the need to apologize for your car. If you really think it's a lemon, drive it into a lake.
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