You guys do realize that if you go to a larger diameter tire than stock and do
not regear the speedo you automatically see a reduction in gas mileage just
because of the speedo error. With a larger diameter tire for the same distance
traveled the speedo will record less mileage because the wheel turns fewer
times for the distance.
In the case of the 95 4x4. Assuming the largest stock tire the factory provided
at 235/75-15 with a 29" diameter and going to 31/10.5-15 at 31" diameter that
equals a 7% difference in circumference or about 1mpg on a 12mpg base.
Just one more factor in the gas mileage equation.
Dave Clement
99 SLT+ CC 4x4
In article <200506271556.05585.billday@otecom.net>, billday@otecom.net (Bill
Day) writes:
>
>
> Yes it has been hashed and hashed again. Here Lately I have been keeping
> track of my mpg on each fill up and was absolutely amazed at what I was
> getting. Since I purchased this truck(used '95 CC 4x4 V6) I have ran
> 31x10.5x15 Courser MT's on 15x6 steel rims. My mileage was horrid, at
> around 12mpg, due to the lack of gearing(has 3.55's). On my last tire
> purchase, I still went with Courser MT's but dropped to 30x9.5x15's. Upon
> the purchase of these tires I noticed an instant increase of mileage but
> never got to concerned. Well I finally got curious, my mileage is averaging
> 17mpg now. I get 18mpg on open road trips with no wight. If I am towing
> heavy loads I go as low as 15mpg.
>
> The basic info here is that all though tuneups will help, oil changes spark
> plugs airfilters etc... The tire size in association with your stock
> gearing will make an ultimate decision. The 31x10.50x15 that come on stock
> GenIII 4x4 in association is the ultimate gearing for that tire size and axle
> ratio giving you that average of around 18mpg. if your gear was say moved to
> 4.10(11 etc) ti would ultimatley put your mileage back to where it was.
>
> Well i hit http://www.ringpinion.com/ and it seems that the final gear ratio
> calculator has been removed replaced with a different one, however 4lo.com
> ( http://www.4lo.com/calc/geartire.htm ) is still intact.
>
> have fun with it and see where your at.
>
>
>
> On Monday June 27 2005 2:40 pm, Hop * wrote:
> > Well, if you find out how to improve your milage lemme know.
> > I've got a '97 cc 5.2 4x4 with 6" of lift and 32" tires.
> > If you can get yours above 9mpg i'm all ears.
> > My milage is horrid. I've got autolite 3923's, 360 intake tube, Intense
> > performance air hat, msd wires, 180 tstat, accell brass cap and rotor, 3:55
> > gears.
> > --Hop
> > http://dodgetruckworld.tenmagazines.com/member.asp?90558
> > http://home.swbell.net/hopsdak/dak.html
> >
> > >From: Barry Oliver <barrysuperhawk@insightbb.com>
> > >Reply-To: dakota-truck@dakota-truck.net
> > >To: dakota-truck@dakota-truck.net
> > >Subject: DML: Gas mileage [how to improve]
> > >Date: Sun, 26 Jun 2005 19:27:47 -0500
> > >
> > >
> > >OK, I am archive callenged, so I will re-ask the milage question for the
> > >millionth time. What is the list of $hit to check to make sure your
> > >mileage is as good as it can be?
> > >
> > >99, 4x4, 5.2L, 105,000mi, bone stock except for big tires.
> > >
> > >Air up tires
> > >Clean air filter
> > >Sparkplugs? what kind? How often?
> > >Cap'n Rotor? what kind? How often?
> > >
> > >
> > >What Else?
>
> --
>
>
> Bill Day
>
> "A rich man isn't always wealthy, he just has all the love he can give and
> ever wanted.."
> http://counter.li.org #384146 284016
>
This archive was generated by hypermail 2b29 : Fri Jul 01 2005 - 09:48:06 EDT