TBI 454 vs. TBI 383

[ericjon262]

Originally Posted by SSC's76

454 will be better choice. I would not put the 383 back in my truck for any reason besides it suits the wifes apollo alot better. Her car is just evil quick one day i will convert it to power steering and have some fun. I use mine to pull and I have flat smoked power strokes and cummins up mountain passes with equal loads. loaded on the highway I get 17 mpg and that is no joke. By loaded I mean A bed full of camping goods and a pop up trailer. If I stay right at 65 it seems to do the best. funny unloaded I only get mid 15 but I do tend to drive more at 75. The bb just seems to not work as hard as the 383 did and the 383 was pushing a tad more power. City mileage is not to bad granted that is the one area where the sb ate less fuel but nothing to noticeable unless gas keeps going up in price.

how are you calculating fuel mileage? every BB truck owner I know is under 14 MPG, my dually gets 9 MPG on the flat ground of FL, unloaded, drafting an 18 wheeler.

Edit: and that's maintaining 55-65 MPH

[USSkoval]

Originally Posted by ericjon262

how are you calculating fuel mileage? every BB truck owner I know is under 14 MPG, my dually gets 9 MPG on the flat ground of FL, unloaded, drafting an 18 wheeler.

Edit: and that's maintaining 55-65 MPH

It seems the truck in question may be a little half ton short bed, I can see where 17mpg may be possible. My 454 Burb has seen 13 mpg... loaded with a wife and five kids, luggage and tools, all while going 75 mph down the highway, with a lot of that being in the mountains.