What kind of mileage are you getting with your conversions.

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07-26-2012, 10:05 AM
85 silverado

What kind of mileage are you getting with your conversions.

Just testing the waters here for a conversion. As of now this would be going into a rcsb 4x4. What is the best and average you are getting with maybe slight mods like mild cam and headers,tune,etc. to no mods. What engine/trans are you running and so forth.
07-26-2012, 12:38 PM
Crazy Blu

Dont think many here keep track of that s much as others do.
07-26-2012, 12:42 PM
Clayman

Quote:

Originally Posted by 85 silverado

Just testing the waters here for a conversion. As of now this would be going into a rcsb 4x4. What is the best and average you are getting with maybe slight mods like mild cam and headers,tune,etc. to no mods. What engine/trans are you running and so forth.

With just a tune in my 5.3/4l60 and 3.73 gears in a ecsb 4x4 i get 14-16 around town. Which is 2-3 better than the tbi got. Last weekend i drove from va to pa on I-81 going 75-80 mph and got 17.2 over the whole trip. If i was driving around 65-70 mph i would hope it would rise to 18-18.5 as that is where 3.73s seem to be happiest.
07-26-2012, 04:11 PM
Frenchy

4.3 V6, average 21. 5.3 V8 with heads/cam, average 24.
07-26-2012, 05:29 PM
Clayman

Quote:

Originally Posted by Frenchy

4.3 V6, average 21. 5.3 V8 with heads/cam, average 24.

What is it in?! And also what year 5.3?
07-26-2012, 07:27 PM
00shortbox

Used to have a 4.3L 5 speed 2wd and averaged 20-21, now have a 5.7 LS6 with the mods in my sig, haven't calculated it since my speedo is way off, but its a lot better than the 4.3 especially on the highway, I'd estimate I'm getting anywhere between 24 and 27mpg with the LS6, not driving the piss out of it. At 85mph it's basically the weight of my foot on the pedal pressing 1/16"on the gas pedal instead of between 1/4 and 1/2 throttle with the V6.
07-26-2012, 08:59 PM
Frenchy

Quote:

Originally Posted by Clayman

What is it in?! And also what year 5.3?

It's in the truck in my sig. 2005 LM7 5.3.
07-26-2012, 09:56 PM
RS/SS 4.8

Quote:

Originally Posted by 00shortbox

Used to have a 4.3L 5 speed 2wd and averaged 20-21, now have a 5.7 LS6 with the mods in my sig, haven't calculated it since my speedo is way off, but its a lot better than the 4.3 especially on the highway, I'd estimate I'm getting anywhere between 24 and 27mpg with the LS6, not driving the piss out of it. At 85mph it's basically the weight of my foot on the pedal pressing 1/16"on the gas pedal instead of between 1/4 and 1/2 throttle with the V6.

WTF my 4.8 gets 15 mpg no matter what i do.:sad:
07-27-2012, 12:12 AM
kerrige

Quote:

Originally Posted by RS/SS 4.8

WTF my 4.8 gets 15 mpg no matter what i do.:sad:

The 4.8 ia the problem. :lol: although mine gets 17 so im not sure.
07-27-2012, 06:28 AM
RedHeartbeat

Fbody headers are supposed to fit pretty good.
07-27-2012, 12:32 PM
HPICamaroSS

Quote:

Originally Posted by 85 silverado

Just testing the waters here for a conversion. As of now this would be going into a rcsb 4x4. What is the best and average you are getting with maybe slight mods like mild cam and headers,tune,etc. to no mods. What engine/trans are you running and so forth.

14 to 15 with tune
07-31-2012, 08:55 PM
stevebbc

16 avg in 86 K5 blazer with stock 02 5.3 tahoe motor, 700R4 and 3.73
07-31-2012, 09:10 PM
lilred04

i get bout 20 with my 4.8 if i stay out of it
08-07-2012, 12:51 AM
88RCLB

I wouldn't advise doing the swap for mileage.

However, if you want to talk your wife into the swap the 1-2mpg increase can't hurt your argument. All the little things turn into quite a bit more $ than rebuilding your stock motor with a decent cam, so it's really not worth it to gain anything.
But, if you drive it normally I doubt you could get it to do worse than a worn-out motor that you currently have. (assuming you keep the fuel injection and don't get to crazy with your cam/stall choice).