My Truck came with 31x10.50's. I currently run 325/60r15's, which
measure 31x13.50. Other than being heavier and wider, they are the same
diameter. I think *MY* tire problem isn't speedo error, it's just the
fact that they are HEAVIER...
david.clement@verizon.net wrote:
> 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