Is throttle body spacer really more efficient for fuel economy? 2001 Jeep Grand...

...Cherokee, v8? Hi,
I have a 2001 Jeep Grand Cherokee v8, and it's been very well maintained; the time's been good to us.
Now I'm planning on getting a throttle body spacer, and wondering which brand is actually worth the $80, if one is even worth getting.

JGC and I:
1. odometer: 155,000miles
2. bug shield
3. didn't count on Bush pissing off the petrol exporters. America should thank him and his cronies for profiting like leaches, and refusing to pay the tax now.

any intelligent support would be appreciated
and please don't reserve a great advice on improving mpg
cheers!
 
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