Another oxymoron
 

Just wondering what m.p.g. are getting with a 454 in 2-wheel 1/2 ton truck???? Anyone ever mess with carb,timing,advance,overdrives, or bolt-ons to get better mileage with a 454??? I would love to get 13-14 m.p.g with a 3.40 gear

Drove from Mpls/St Paul area to 1 hour south of Sioux Falls, SD.
this past Sunday. 540 plus miles rt.

"91 Suburban, 454 Auto, 3/4 ton two wheel drive. 130K miles.
Don't know the rear gear. (Don't care either :hm: )

Got 14 mpg down and back, Cruise set on 65-70mph

Last fall went to Chicago with an open trailer to pick up an '81 drag Camaro.

Down, trailer-no car we got 12.8 mpg. On the way back with the Camaro
we got 13.0. (We figured it must be more aerodynamic.

Cruise at 75mph.

Just my .02

:gmc:CCDually

I have a '93 3/4 ton 4wd that I've got 14.5 on the interstate with. Just around town it's about 12. It has a standard trans with od.