[BFix] Thinking outload gas mileage and EB....

[Joe Lougee]

I have gotten in the 17+ range for extended distances, but not often.

Rig was:
1.  MAF SEFI Roller 351W with ZF and D20.
2.  4.10 gears.
3.  35" MT/Rs.
4.  Full doors and bikini top.

At around 55-60 MPH it would get 18.5-19.  The only time I can drive 
that was on the way to CA, following Clint's Dad's trailer.  They 
couldn't get enough tongue weight on it so had to drive slow to stop the 
"waggle".

At 65-70 it would average around 17.5 on the highway.

Around town I would get 15.5 on average, but would get .75-1MPG better 
with the hard top on.

I'm currently building another with a MAF SEFI Roller 408 stroker, built 
AOD (_without_ the lock-up feature), 4.88 gears and 40" MT/Rs.  It'll be 
interesting to see what it'll get for mileage!!
Joe


Erik Christensen wrote:
> gearing has absolutely nothing to do with mileage in a Bronco.  I've 
> tested extensively, from 3.50 to 4.88, and the only thing that matters 
> is your cruise speed. 50mph might get 18mpg. I never beat 17, but some 
> claim to, although set ups vary. Mine was generally with 35" mudders, 
> 5.5" total lift, and SEFI.various transmissions.
>  
> 90-100mph, 10-12mpg.
> 70-80 mph 13-14mpg.
> 55-65mpg 15-16mpg average
> 50-55mph I got 17mpg the one trip (full tank- hwy) I tried it. 
>  
> As far as I'm concerned, I'm going to run out of time before we run 
> out of oil, so I drive fast :)
>  
> YMMV  :)
>
>     ----- Original Message -----
>     *From:* Jim Lemanek <mailto:hucklburrybronco at sbcglobal.net>
>     *To:* mail at broncofix.com <mailto:mail at broncofix.com>
>     *Sent:* Wednesday, May 07, 2008 8:21 PM
>     *Subject:* [BFix] Thinking outload gas mileage and EB....
>
>     Reading all that we do, it looks like someone with a 5.0 and an OD
>     tranny like a ZF gets maybe 18 mpg.  What gears is that with?
>      
>     So if I were to keep the 3.50 gears, install a 5.0 and a ZF, any
>     guess what I could get?
>      
>     According to gear calcs, an OD at .75 and 34" tires, at 70 mph I
>     get 18XX rpm at 70 with 3.5 gears and 21XX rpm with 4.11.
>      
>     What do you think that would do to mpg? Stock 92 mustang 5.0.
>      
>     Just wondering thoughts.  I was gonna ask best mpg setup as an
>     excercise but quickly realized I would get a discussion on 4bt
>     probably.  Thats a bit outside my motivation based on my current
>     resources.
>      
>     --Jim
>
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