Throttle spacers, intake kits

[gsmarquis]

I am looking to increase my MPG not power as much as MPG, although power would be nice as well. I have heard about those throttle spacers.....do they really increase power and MPG? and does a intake system increase MPG? or just power?

[DURANGO 5.9]

Spacers might help on mpg but no improvement in power.I've had one I dont anymore. Intake system will help with everything you want.

WIll