Hey Alex!
That's an interesting question! One that I can not answer with numbers, but
want to attempt the theory side for a minute. I had an '86 Isuzu Impulse
(used) that had an onboard computer which showed a correlation between the
vacuum of the engine and the gas mileage. I experimented with different
acceleration habits to obtain the best city mileage I could. I found out
that if I accel'ed as fast as possible without introducing the turbo I got
the best results. It's weird. I thought if I babied it up to speed I would
get better mileage. But the way it worked out was the longer you accelerate,
the more gas it uses versus getting up to speed a bit faster and maintaining
your speed. Make sense?
With the gearing, I agree the engine should have an easier time getting up
to speed. That is the gearing I use and have no problems with gas
consumption in the city or highway. It seems to be a good combination with
the ability to pull a trailer also.
I think it is going to come down to the driving habits more than anything.
My 3.9L gives 21.5mpg (80% hwy), 17.5 (80% cty) and my 4.7L gives 19.5mpg
(80%hwy), 16.5mpg (80% cty).
Sorry I couldn't give you a direct answer, but hopefully this will help!
Sean
'92 RC Sport 3.9L 5spd - 250,000mi!
'01 CC SLT+ 4.7L 5spd 3.92 LSD Mobil-1!
-----Original Message-----
From: Alex Harris [mailto:jetcity@swbell.net]
Sent: Friday, March 09, 2001 9:35 AM
To: dakota-truck@buffnet.net
Subject: DML: Gas mileage and gear ratio
Here's a question... when I switch from 3.21's to 3.92's will my city gas
mileage go up? Seems to me the engine will have to work less to get the
truck up to speed. Any experience with this, anyone?
- Alex
> From: Doug Fedeli <rdf@eznet.net>
>
> The last time I drove mine all highway I got 18.5 mpg. That was pulling a
27ft
> popup camper that weighs about 2500lbs. My truck has the V6, 5 speed, 3.55
SG.
> I run about 17 in everyday driving.
>
> Doug Fedeli
>
> Alex Harris wrote:
>
>> Heh heh... I get 18 hwy, 13 city on my V6 manual. But I have the on/off
gas
>> pedal option on mine too...
>>
>> - Alex
>>
>>> From: Jack Paulson <cybermail1@yahoo.com>
>>>
>>> Should've had a V-6 19 highway, City 17.5
>>>
>>> --- fawcett@uism.bu.edu wrote:
>
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