Thx. Sounds like our gearing is identical. I get 8-10 mpg depending on number of hills, hwy vs city etc.

Here's graphs of D.D. tq/hp for Edel Perf, CC260H and Pontiac 9779066.





But sure, maybe it isn't tuned right, still. Would a degree of timing or being 1 stage lean or rich completely throw performance out the window?

...what is a sure fire way to set timing perfectly?
...what is a sure fire approach for dialing in carb?
...anything else I can do?
...how do I verify my 7 year hi flow old cat.conv. is not plugged?
...what else could rob lots of power?

Apologies if this is OT.

Michael