Bump For my last post

 

Redline SL-1... This stuff talks the talk and walks the walk...

 

Redline for fuel and sea foam for cleaner engines.

 

I ended up using seafoam for the fuel

 

No, it's not OK to leave RedLines injector cleaner in a near empty tank for any length of time! This stuff cleans very well and might clean the krud from the bottom of your gas tank and load up your injecters. Half a tank is safe but nothing less...I speak from experience!
Gary

 

I would not clean anything at 30+k
Your engine should not be clogged up with anything at that kind of millage (unless you used some really nasty fuel that you mopped off the floor)
I would blame fluids on your poor gas millage.
Invest in to good quality fluids through out the entire vehicle and enjoy good millage.
New quality engine oil
Good synthetic gear oil for the diff

 

My opinion is that you are not going to see a major difference between those products.
They will all do the job with a similarly equal results. Each brand uses all kinds of marketing tactics to gain more market traction than it's competitor. At the end of the day that's just what they are, "Marketing tactics". All products will deliver and equal results IMO and clean your engine sufficiently.
Use of majority of those products is redundant anyways.

I have 170k on my G and I only used Seafoam once at 100k. No difference was noted after seafoam use. I'm still getting 21/25 mpg before and after the seafoam.
As I've mentioned before, IMO your main millage culprit are the fluids and moving parts.
So pay attention to everything that rolls and has any kind of friction after the engine. Lubricate and maintain those parts properly in order to reduce the friction.