I foamed my 94 Bravada a few months ago and I didn't notice a difference. I have 242,000 miles and I am getting about 18-20mpg.

 

damn from 12 to 24 is a pretty big improvment
Idk my 94 4x4 w/4.3 vortecs been getting about 14-16 but had a bad regulator/stuck egr havent checked yet what im getting now but would like to get a lil more gas out of it thsn brfor

 

He isn't getting 24mpg... He's put on 24 miles since he seafoamed it!

 

My blazer is about to hit 200k and I "did" this but my local napa didn't carry seafoam so I used their proprietary crankcase cleaner. I really haven't had the opportunity to run through a full tank of gas yet but I opened up the engine and not a single bit of sludge or any crap anywhere. My mechanic told me it seemed to be producing more power but if it was the difference was so minuscule that I couldn't notice

 

It's up to about 45 miles on her now. Got about a 30 mile trip today. Gonna pick up some newer fenders and hood from a local guy, their off a 94 same color and in much better shape then mine. I'll top it after coming back and see where the MPG'S are.

 

Threw a 1/3 of a can in through the brake booster line tonight and ran it. Put the rest in the gas tank. I'll fill it up tomorrow for the week and let you guys know how she runs.

 

seafoam is effectively used when you run it throught the vaccum line connected to the power brake booster you pull the line off and stick a smaller like into it and put the other end in the bottle let it suck it out untill it stalls or shut off immediatly when it is empty let it sit for ten minutes and call the fire department lol cuz its going to smoke the town out

 

yeah thats what i did

 

I did just as you stated and it really didn't smoke all that much. I have seen some where it looked like a blown head gasket!
YouTube - Seafoaming the Rusty Whale Sperm.

 

my celica smoked more then the blazer did