What to reasonably expect from a TBI big block. 2wd suburban.
I'm thinking 10 on the freeway
I'm thinking 10 on the freeway
CK5
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454 tbi mileage
- Thread starter blazinzuk
- Start date
OD or no? Probably get 11-12 with OD
thearborbarber
1/2 ton status
Currently averaging 11mpg with 75% hwy, 25% city driving. 93 454tbi sub 4x4.
I did a touch better than 11mpg going out with aftermarket TBI. Haven't figured return mileage yet.
Turbo 400 3.42 gears
I know it's not a tbi but we just ran to Prescott and back 300 miles and averaged 11mpg doing 60-80 with hills etc and a couple of hard pulls here and there.
4l80, 3.73s and stock tires (265/75/16) c2500 burb
4l80, 3.73s and stock tires (265/75/16) c2500 burb
That 91 Dually I had got 8mpg towing 7k at 70mph. Got 11-12mpg empty at 70. Motor was bone stock, only mod was free flowing exhaust. 4.10's and a 4l80 trans. with 265/85r16 tires
I'm thinking my 9 to 10 estimate is safe. No overdrive just means I'll likely set the cruise at 65
Being limited by power is not the same as being limited by fuel consumption
I think the 9-10 range is a safe bet.
Isn't that the whole problem you're trying to get away from?
No. I don't mind being a little slower than most. It's being alot slower. The 6.2 unloaded was fine. 80 mph no problem
Yep slowing down for fuel consumption is voluntary, slowing down because you lack power is compulsory.
Boost all the things! 
Boost the 6.2 overboard into the lake!Boost all the things!
You know it wouldn't make it that far. It would get stuck on the dock with a broken crankshaft.
Put 30 PSI to it and when it scatters do a Cummins swap
