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Better Gas Mileage for a 99 Jimmy SLT


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#1 99SLT4.3

99SLT4.3

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Posted 15 November 2005 - 09:40 PM

Anyone try the FIPK, headers,velocity tuner, or module/chip?
I get 20-22 MPG on the highway with the 3.73 rearend. I've seen
26 MPG in the mountains @ 8K' in Yellowstone, running 85.5 octane.
This is with a bone stock 99 Jimmy SLT with just a K&N airfilter.
Any suggestions?
1999 GMC Jimmy SLT w/ Wester's "TUNE" & K&N (SOLD)
2003 Chev. Trailbalazer LT w/ WAIT4ME "TUNE"
2004 GMC Envoy SLT XL

#2 holstbnet

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Posted 17 November 2005 - 12:10 AM

I have an FIPK on my 03 S-10 LS 2wd pickup with 4.3 auto and 3.42 gears. I get 20mpgs around town and 24-26 on the highway. You aren't going to see much more than what you already get right now. I'm told electric fans help BIG time and underdrive pulleys work as well. I have Hypertech programming but that didn't do anything performance OR mpgs.
Dave Holst
03 Chevy S-10 LS 4.3 auto
96 Chevy Beretta Z26
96 Chevy Beretta 1SB
Check out my website http://www.onstarforum.com !!!

#3 99SLT4.3

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Posted 17 November 2005 - 01:50 PM

I have an FIPK on my 03 S-10 LS 2wd pickup with 4.3 auto and 3.42 gears. I get 20mpgs around town and 24-26 on the highway. You aren't going to see much more than what you already get right now. I'm told electric fans help BIG time and underdrive pulleys work as well. I have Hypertech programming but that didn't do anything performance OR mpgs.

<{POST_SNAPBACK}>


Thanks for the tips, I'd like to find out more about the underdrive pullys and especially the electric fan. Do you have any info. on either? TIA
1999 GMC Jimmy SLT w/ Wester's "TUNE" & K&N (SOLD)
2003 Chev. Trailbalazer LT w/ WAIT4ME "TUNE"
2004 GMC Envoy SLT XL

#4 busta

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Posted 17 November 2005 - 02:38 PM

If it is anything like my wifes 04 Blazer good luck getting any better mileage. The 4.3 sucks the gas and in combo w/ the 4x4 and small tank gas mileage is terrible. Not to start another topic but personally I would never purchase another S-10 Blazer again.