viknguy
Registered Member
7.6 MPG how do i fix this? 
or is it impossible
or is it impossibleCK5
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anyone have bad gas mpg as me?
- Thread starter viknguy
- Start date
55Willy
3/4 ton status
6 for me if i'm on it. keep your foot outof it and use overdrive and just cruise...LOL
I've had some bad gas tonight... I think it was the taco bell I ate for lunch.7.6 MPG how do i fix this?
More info is needed. Is your rig carb or FI? Have you recently tuned it up? What gear ratio and tire size are you running? There are many variables that will change your fuel mileage. Give us more details.
viknguy
Registered Member
viknguy
Registered Member
6 inch lift 35s my gears are at 3 something the guy told me at 4wheel parts umm replaced distributer cap and rotor and spark plug and wires and its all msd and i also replaced the fuel filter and im also running the highest gas which i think is supreme and its FI
K5Blazer28
1/2 ton status
i get 8 mpg... =\ running 33s with 4 inch lift and thats with the ac off going WITH the wind. HAHAHA
Thunder
3/4 ton status
If you are FId you should be doing better than that. I get 15 average in my TBI K5 350 700r4 33" MT tires 4" lift 3.73 gears on 87-89 octaine. You may have a bad sensor like the 02 or something. If so the computer goes into limp home mode. The engine will run ok but will usually get bad MPG when that happens. Check trouble codes or put it on a scanner.
I averaged ~12 with my stock (175K) 350 (Q-jet)/SM465 3.73 rear, same mileage with 31's and 33's.
I jumped up to 12-15 with my 383 (vortec heads, full roller) and same running gear. Going to 37's and 4.56's kept it about the same.
IMO: anyone getting less than 10 mpg with a SBC in a K5 has a poor gear ratio for their tire size (sometimes compromised for better offroad performance), a poor running motor or a heavy foot.
I jumped up to 12-15 with my 383 (vortec heads, full roller) and same running gear. Going to 37's and 4.56's kept it about the same.
IMO: anyone getting less than 10 mpg with a SBC in a K5 has a poor gear ratio for their tire size (sometimes compromised for better offroad performance), a poor running motor or a heavy foot.
K5Blazer28
1/2 ton status
viknguy
Registered Member
ill check that out but maybe i mite have a heavy foot but hey who doesnt love a rumble when you floor it cause i sure do
ummm, what tranny? I hope it's not a 700r4, if it is, you've got a major prob...
My '85 K30 gets 5 mpg.
Its doing better on fuel right now because its sitting inside a storage shed in hibernation.
Its doing better on fuel right now because its sitting inside a storage shed in hibernation.
sgarrison
1/2 ton status
I only get between 7 or 8 m.p.g. on the hiway. Motor is very tired.
1-tonmudder
1/2 ton status
7.6 MPG how do i fix this?
Here ya go.
sgarrison
1/2 ton status
That should do it!Here ya go.
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I was getting 3 to 4 with my tired carbed 350, then motor swap to a TBI 350 and now I get 14. That is with 4.10's, 350 turbo trans, Np205, and 37's.
Yep your gear ratio sounds bad, I would shift manually and you probably don't need to touch overdrive or high gear unless you are on the highway.
Yep your gear ratio sounds bad, I would shift manually and you probably don't need to touch overdrive or high gear unless you are on the highway.
You've confirmed your speedometer is reading correctly?
lak2004
1/2 ton status
I get about 7 with a tired carb 350, goin to a 6.2 diesel soon and hope to get 20
