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Old 10-03-2012, 03:32 PM   #10 (permalink)
oil pan 4
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Join Date: Jul 2011
Location: NewMexico (USA)
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Sub - '84 Chevy Diesel Suburban C10
90 day: 19.5 mpg (US)

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Originally Posted by camaroman101 View Post
my last two tanks were 18mpg 40%city and 15.6mpg 75%city

the 3.23 i have now were part of an optional performance axle package, stock they came with 2.73. how much of a difference would that make in mpgs?
2.73 on a V8 with Th700 or 4L60x isnt the holy grail of V8 fuel economy but its darn close.
At some point I would like to go from 3.08 gears to 2.73 gears, I expect to pick up a little under 2mpg.
You would see at least that.
My metric for picking up MPGs is to try and stay under $250 per 1 MPG gained.
By the time you bought and installed the 2.73 rear, sold your old one I bet you could be in it for less than $500.
The 2.73 rear ends are toxic to the performance 1/4mile guys, they will all but give them away for free.
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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