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10-21-2005, 04:54 PM | #26 | |
Registered User
Join Date: Dec 2004
Location: Northern AZ
Posts: 7,270
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Re: 4.3 in 71 getting 19 MPG?!?!?
Quote:
My Yukon XL mentioned above is a 4X4. The thing we are not mentioning, but that is important is tire size, axle ratio, etc all of which have an effect on milage as well as flat roads or mountains. My Yukon has the 3:73 with 285/50/20's, she is a pig from a dead stop but you better look out once I get rolling. |
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10-21-2005, 07:04 PM | #27 |
Senior Member
Join Date: Jun 2001
Location: Shelbyville, KY
Posts: 3,261
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Re: 4.3 in 71 getting 19 MPG?!?!?
Had a 91 full size with 4.3 and auto--got 21-mph hwy. My 2000 Z71 with 5.3 will get 21mph if you keep it under 70---even with the 373 gears. The 4.3 is an excellent motor but expensive for a rebuilt. Have not heard many raves about the inline. I personally have never had luck with an inline GM 6 going back 40 years. Keep in mind the 4.3 is a 350 less the last 2 cylinders. My 91 had adequate power for normal use and I was very pleased with it for 135000 miles.
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