I have also been told by my friend that he has seen better fuel
efficiency with his newer Dodge truck when switching to Synthetic
oils...

I don't see the logic because as mentioned before, viscocity is viscocity...

Realistically, the benefit of synth was to improve the length of time
it held that viscocity without breaking down...that said, I will use
Dino oil and change it more frequently and still save money...I've
read many articles, and one specifically posted out here (check the
archives) that said it was almost like flushing money...I think the
one article was based on using it in a motorcycle...the similarity in
high RPM is there, but certainly no similarity in our motors pulling
much higher relative load...

Why are we discussing this again? But then again, here I am weighing in ha!

Dave in Central FL that missed Katrina
85 GL "Baby Bus"
85 "Name Game"
80 something maybe soon...
93 Ford Van
85 Pace Arrow motorhom soon to become extinct because of gas mileage...