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05-31-2013, 10:27 AM
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#1 |
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Registered User
Join Date: Apr 2013
Location: pleasant hill missouri
Posts: 8
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Fuel mileage
Hey all, getting ready to swap my 3/4 setup to 1/2 ton. Have a free 1982 donor truck with 2:73 rear end. I drive my truck 90 miles a day, it has a 350 with 400 turbo. Anyone else running that high of a gear, and if so, what kind of mileage you getting?
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05-31-2013, 10:38 AM
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#2 |
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Registered User
 
Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: Fuel mileage
You should also indicate tire size. With a 28" tall tire you'll be around 2129 RPM at 65mph. That sounds right in the power band. You may lose a little out of the hole as the gear will be higher which may drop mileage for stop and go.
You can check gear calculations here.
__________________
1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 Last edited by Longhorn 70; 05-31-2013 at 10:48 AM. Reason: math error |
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05-31-2013, 10:46 AM
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#3 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Fuel mileage
doubt you will see any better milage more than likely worse in the 8-9 mpg range and it sure wont b any fun around town from a stoplight
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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05-31-2013, 10:51 AM
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#4 |
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Registered User
Join Date: Apr 2013
Location: pleasant hill missouri
Posts: 8
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Re: Fuel mileage
Tire size will be 29"
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05-31-2013, 10:58 AM
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#5 |
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Registered User
Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: Fuel mileage
You'll be OK if you do JUST freeway driving. The starts and stops will just kill mileage.
At 65 you'll be around 2055 RPM....GOOD for mileage. Getting there will be not so good. Driving style and load will make big differences.
__________________
1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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