Go Back   iRV2 Forums > iRV2.com COMMUNITY FORUMS > iRV2.com General Discussion
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 08-17-2008, 07:32 PM   #1
Senior Member
 
RedGuy's Avatar
 
Join Date: Jul 2008
Location: Waterford, Michigan
Posts: 119
I just got back from a long weekend camping trip and I found that my milage was up quite abit from my other trips. I got 9.5 mpg this trip where as I only saw about 8 mpg on previous trips, that's an 18% increase. So on my 320 mile round trip I figured I saved about $25! What changed? I aired up the tires on my TT from 40psi to 50psi, that's it. So air up those tires! I also cruised alittle faster going 60 mph most of the trip instead of 55 mph since I noticed the truck wasn't working as hard and seemed to be moving at 60 quite well. I know that 9.5 mpg may not seem great to some people, but considering my truck only gets 10.5 mpg unloaded I think I'm doing pretty good, esspecially on a 22 year old, carborated truck. Now I tow my 21ft TT with a pretty small vehicle compaired to alot of you guys, an 86 Jeep Grand Wagoneer with a 5.9L V-8, and I'm pretty much maxed out as far as my limits go. My max combined vehicle weight is 10,000lbs, and on the way up I stopped at a flying J and weighed in at 10,360 lbs, alittle over. Guess I need to leave some water behind next time.

I've always know running higher tire pressure increased your milage, but I didn't expect to see such a large gain. I however wouldn't expect to see this much gain on a larger tow vehicle, but hey any savings go right into your pockets!



__________________

__________________
We live and we die by time. And we must not commit the sin of losing our track on time.

RedGuy is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 08-17-2008, 07:32 PM   #2
Senior Member
 
RedGuy's Avatar
 
Join Date: Jul 2008
Location: Waterford, Michigan
Posts: 119
I just got back from a long weekend camping trip and I found that my milage was up quite abit from my other trips. I got 9.5 mpg this trip where as I only saw about 8 mpg on previous trips, that's an 18% increase. So on my 320 mile round trip I figured I saved about $25! What changed? I aired up the tires on my TT from 40psi to 50psi, that's it. So air up those tires! I also cruised alittle faster going 60 mph most of the trip instead of 55 mph since I noticed the truck wasn't working as hard and seemed to be moving at 60 quite well. I know that 9.5 mpg may not seem great to some people, but considering my truck only gets 10.5 mpg unloaded I think I'm doing pretty good, esspecially on a 22 year old, carborated truck. Now I tow my 21ft TT with a pretty small vehicle compaired to alot of you guys, an 86 Jeep Grand Wagoneer with a 5.9L V-8, and I'm pretty much maxed out as far as my limits go. My max combined vehicle weight is 10,000lbs, and on the way up I stopped at a flying J and weighed in at 10,360 lbs, alittle over. Guess I need to leave some water behind next time.

I've always know running higher tire pressure increased your milage, but I didn't expect to see such a large gain. I however wouldn't expect to see this much gain on a larger tow vehicle, but hey any savings go right into your pockets!



__________________

__________________
We live and we die by time. And we must not commit the sin of losing our track on time.

RedGuy is offline   Reply With Quote
Old 08-18-2008, 10:55 AM   #3
Senior Member
 
historyljc's Avatar
 
Tiffin Owners Club
Freightliner Owners Club
Join Date: Feb 2008
Location: Pensacola, Florida
Posts: 5,173
For what pressures are your tires and rims rated?
__________________
Travel well, travel safe,
Jim
2006 Tiffin Phaeton - 2011 Cadillac SRX
historyljc is offline   Reply With Quote
Old 08-18-2008, 12:06 PM   #4
Senior Member
 
RedGuy's Avatar
 
Join Date: Jul 2008
Location: Waterford, Michigan
Posts: 119
50psi cold, they're all load range C tires. Never heard of a rim pressure rating though. I would think you'd have to be dealing with alot more than 50psi to even start to worry about pressure on a steel rim.
__________________
We live and we die by time. And we must not commit the sin of losing our track on time.

RedGuy is offline   Reply With Quote
Old 08-18-2008, 07:39 PM   #5
Senior Member
 
Appalachian Campers
Coastal Campers
Join Date: Mar 2003
Location: New Bern,NC
Posts: 2,032
Well I got one different. My wife's car a 04 Buick Rendezous was getting 28 mpg highway and 25 mpg everyday with Firestone 215- 70-16 tires. I was going to get Michleins but where I bought my tires from talked me into TOYO same size tires and mileage dropped to 25 mpg highway and 23 mpg everyday driving. airpressure was at 32psi but increased it to 35 psi. But it looks like it still falling off. I also put a new air cleaner as the car has 40,000 miles. any idead?
__________________
diandtom is offline   Reply With Quote
Old 08-19-2008, 03:52 AM   #6
Moderator Emeritus
 
TXiceman's Avatar


 
Vintage RV Owners Club
Texas Boomers Club
Oklahoma Boomers Club
Ford Super Duty Owner
Join Date: Aug 2000
Location: Full Time, TX Home Base
Posts: 17,150
Blog Entries: 21
diandtom, my first thought is to check the rolling circumference of the new tires vs your older tires. That can have an effect on the mileage. Your odometer only looks at the number of times the tires go around and it is set up for a specific circumference.

Ken
__________________
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot
TXiceman is offline   Reply With Quote
Old 08-20-2008, 12:47 PM   #7
Senior Member
 
Workhorse Chassis Owner
Join Date: Jul 2005
Location: USA
Posts: 769
RedGuy, I miss my '77 Cherokee with 360 motor and Quadratrac. 11 miles to the gallon!! A great stump puller and it went where the goats wouldn't dare!! Goodluck to you!!
__________________
TandW
TandW is offline   Reply With Quote
Old 08-20-2008, 03:58 PM   #8
Senior Member
 
RedGuy's Avatar
 
Join Date: Jul 2008
Location: Waterford, Michigan
Posts: 119
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by TandW:
RedGuy, I miss my '77 Cherokee with 360 motor and Quadratrac. 11 miles to the gallon!! A great stump puller and it went where the goats wouldn't dare!! Goodluck to you!! </div></BLOCKQUOTE>


Yeah, I really like these trucks. This is my third one, and the nicest one I've had so far. I started out with a 1990, then got an 86 and was going to make one nice truck out of the 90 and 86, but realized I'd never find the time for that big of a porject and sold them both as neither truck on it's own was in good shape. For a couple years I just drove my car, but one day I walked into my barber and he said "I have something for you" one of his customers is a used car dealer and he had what's now my 1986 Grand Wagoneer. I've had this one since last October and love it! It was a one owner car from North Carolina, and the previous owner used to own an AMC dealership! So sufice it to say they took VERY good care of it and it shows! I got it 100% stock, 100% rust free and totally unmolested. Something that's getting harder to find on an old 4X4 like this. Most people want to take anything that has four wheel drive and "Wheel" it. I took it down some trails when I was up north, but that's about as off road as this thing will ever get. I enjoy cruising slowly through the woods, but not so much flooring it through mud holes. I personally love the Wagoneers in stock form. The only changes I've made are mechanical, like changing the brakes to 3/4 Suburban brakes. It took me a week to get over drilling the holes to put my brake controller in! Your right the milage isn't stellar, but this is really more my pleasure vehicle and my Crown Vic is my DD, it get's much better milage at about 18 around town and 25 on the highway. I have been driving it quite abit this summer though as I know soon the snow will be flying again and time to put her back in the garage for the winter.
__________________
We live and we die by time. And we must not commit the sin of losing our track on time.

RedGuy is offline   Reply With Quote
Old 08-21-2008, 04:14 AM   #9
Senior Member
 
Ray,IN's Avatar
 
Join Date: Aug 2001
Location: North America somewhere
Posts: 13,699
Rolling resistance is a huge factor in fuel mileage, as you discovered. Vehicle manufacturer's recommendations on air pressure are based on what results in the best ride, not fuel mileage or tire longivity; re: Ford/Firestone debacle.

diandtom; Tread design has a significant effect on fuel mileage and rolling resistance. For instance, M&S tires have more rolling resistance than standard highway tread. The open tread mud grips of yesteryear, are a great example, significant rolling resistance plus very noisy as a result.
__________________

__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution. "Abraham Lincoln"
Ray,IN is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
gas milage Pat P Class C Motorhome Discussions 21 08-20-2007 02:54 PM
Best Fuel Milage Ever! Indyrvfolks Winnebago Industries Owner's Forum 6 05-25-2007 06:08 PM
gas milage tassie94 iRV2.com General Discussion 2 08-08-2006 12:50 PM
Fuel milage arwilda MH-General Discussions & Problems 17 08-06-2006 12:27 PM
P32 Milage FullAstern Workhorse and Chevrolet Chassis Motorhome Forum 3 07-04-2005 04:55 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:18 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.