Carb spacers. pros/cons

[1970pelle]

I apologize if your saying oh no not again.But with the cost of fuel. We,or I am looking at getting all I can get.There has been some VERY good threads on MPG.Nothing beats a well tuned engine,with new quality parts.Myself just dropping my speed has made a big differance.Anyway looking at carb spacers.Poweraid and Transdapt makes one with claims of improved proformance and MPG.I understand the tunnelram effect that is achieved with the use of a spacer.But is there really any MPG gain??I used one on my Dodge Ram PK(EFI) and noticed a proformance gain,really smoothed the truck out.But no way around it.It was a hog all day long.Loved fuel.Glad its gone.Anybody using a spacer?My Truck 86 SWB 305,4bbl,700R4,2.73 gears,all smog removed,duals with turbo mufflers,3 in K&N,has a/c hardly ever used.2 size over stock tires,open bed.Planning on going with a electric cooling fan set up.Still researching what type.And lowering the truck also.I all so noticed the tread on front bumper air dams.I'm currently not using one.Wouldn't that make a allready flat frontend flatter?Thanks all.Sure enjoy this place.Ken