Here is something to think about. Gas mileage depends on how hard the engine is working, right? I can almost guarentee that I can get as good or better mileage from a small block V8 and auto transmission geared for highway usage than the average Joe can get from the 6 and stick. The 6 has to work too hard. Just my 2 cents worth but based on 50 years experience.

Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)