Go Back   EcoModder Forum > EcoModding > General Efficiency Discussion
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-24-2015, 07:00 AM   #11 (permalink)
Master EcoModder
 
oldtamiyaphile's Avatar
 
Join Date: May 2009
Location: Australia
Posts: 1,510

UFI - '12 Fiat 500 Twinair
Team Turbocharged!
90 day: 40.3 mpg (US)

Jeep - '05 Jeep Wrangler Renegade
90 day: 18.09 mpg (US)

R32 - '89 Nissan Skyline

STiG - '16 Renault Trafic 140dCi Energy
90 day: 30.12 mpg (US)

Prius - '05 Toyota Prius
Team Toyota
90 day: 50.25 mpg (US)

Premodded - '49 Ford Freighter
90 day: 13.48 mpg (US)

F-117 - '10 Proton Arena GLSi
Pickups
Mitsubishi
90 day: 37.82 mpg (US)

Ralica - '85 Toyota Celica ST
90 day: 25.23 mpg (US)

Sx4 - '07 Suzuki Sx4
90 day: 32.21 mpg (US)

F-117 (2) - '03 Citroen Xsara VTS
90 day: 30.06 mpg (US)
Thanks: 325
Thanked 445 Times in 314 Posts
Quote:
Originally Posted by mcrews View Post
Trucks are normally geared for mpg on the stock tire. so going TOO tall can be counter productive.
I'd say commercial vehicles tend to be geared low so they can deal with a hefty load, the heavier the rating you go for the lower the gearing will be. Even something as small as my Renault will pull a light load in 5th at 21mph (~3250rpm at 60). Load it up to GCM though and you'll appreciate the low ratios.

__________________






  Reply With Quote
The Following User Says Thank You to oldtamiyaphile For This Useful Post:
mcrews (07-24-2015)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-24-2015, 08:24 AM   #12 (permalink)
Master EcoModder
 
mcrews's Avatar
 
Join Date: Oct 2009
Location: Texas
Posts: 3,523

The Q Sold - '02 Infiniti Q45 Sport
90 day: 23.08 mpg (US)

blackie - '14 nissan altima sv
Thanks: 2,203
Thanked 659 Times in 474 Posts
I'm not talking about 'commercial vehicles' I'm talking about a personal pickup truck. One that has a mileage sticker on the window at retail purchase.
For example, Ram (previously dodge truck) is touting 29 mpg on the highway. They are doing that to meet the stricter CAFE standards.
__________________
MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
  Reply With Quote
Old 07-24-2015, 08:54 AM   #13 (permalink)
EcoModding Lurker
 
Join Date: Apr 2011
Location: US
Posts: 60

Peaty - '03 Honda Insight

Jimmy - '07 GMC Canyon 2wd, Extended Cab, SL
Thanks: 15
Thanked 10 Times in 7 Posts
I have been doing some digging and found that JR here on the forum also has a Canyon and he also went up one tire size and recorded the fuel economy improvement. So I think that is the direction I will be going also. One size up from the default OEM configuration. The stock tire is 225/75R15, and it looks like a 235/75R15 is probably the direction to go with this. I will know more after the drive back on Sunday. :-)
  Reply With Quote
Old 07-24-2015, 09:19 PM   #14 (permalink)
Master EcoModder
 
oldtamiyaphile's Avatar
 
Join Date: May 2009
Location: Australia
Posts: 1,510

UFI - '12 Fiat 500 Twinair
Team Turbocharged!
90 day: 40.3 mpg (US)

Jeep - '05 Jeep Wrangler Renegade
90 day: 18.09 mpg (US)

R32 - '89 Nissan Skyline

STiG - '16 Renault Trafic 140dCi Energy
90 day: 30.12 mpg (US)

Prius - '05 Toyota Prius
Team Toyota
90 day: 50.25 mpg (US)

Premodded - '49 Ford Freighter
90 day: 13.48 mpg (US)

F-117 - '10 Proton Arena GLSi
Pickups
Mitsubishi
90 day: 37.82 mpg (US)

Ralica - '85 Toyota Celica ST
90 day: 25.23 mpg (US)

Sx4 - '07 Suzuki Sx4
90 day: 32.21 mpg (US)

F-117 (2) - '03 Citroen Xsara VTS
90 day: 30.06 mpg (US)
Thanks: 325
Thanked 445 Times in 314 Posts
Quote:
Originally Posted by mcrews View Post
I'm not talking about 'commercial vehicles' I'm talking about a personal pickup truck. One that has a mileage sticker on the window at retail purchase.
For example, Ram (previously dodge truck) is touting 29 mpg on the highway. They are doing that to meet the stricter CAFE standards.
It's still a commercial vehicle. Even the baby Ram 1500 is rated to tow 10,000lbs, which suggests it could be re-geared/ tyred quite a lot for light load economy. Having said that, today's 9 speed autos change the game a bit, you can have a 5 speed while towing and a 9 speed for economy. Almost like having a dual range box.
__________________






  Reply With Quote
Old 07-24-2015, 10:08 PM   #15 (permalink)
Human Environmentalist
 
redpoint5's Avatar
 
Join Date: Aug 2010
Location: Oregon
Posts: 9,418

Acura TSX - '06 Acura TSX
90 day: 28.24 mpg (US)

Lafawnda - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Prius Plug-in - '12 Toyota Prius Plug-in
90 day: 57.64 mpg (US)

Mazda CX-5 - '17 Mazda CX-5 Touring
90 day: 27.07 mpg (US)
Thanks: 3,262
Thanked 3,585 Times in 2,678 Posts
Quote:
Originally Posted by SDMCF View Post
Why? (From an MPG point of view)
I have not researched this idea myself, but some say that the wider (and shorter in length) contact patch forces the tire to deform less while providing the same total area of contact. In other words, all other things being equal, a wider tire might reduce rolling resistance because the rubber doesn't have to bend as much to provide the same square inches of contact with the road.

The trade-off is that the wider profile is less aerodynamic, which becomes an increasing factor with increasing speed.
__________________
Gas and Electric Vehicle Cost of Ownership Calculator







Give me absolute safety, or give me death!
  Reply With Quote
Old 07-24-2015, 10:34 PM   #16 (permalink)
EV convert
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 9,615

Sub - '84 Chevy Diesel Suburban C10
SUV
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)

Snow flake - '11 Nissan Leaf SL
SUV
90 day: 141.63 mpg (US)
Thanks: 228
Thanked 3,138 Times in 2,457 Posts
Check those 4 sizes see which one is cheaper.
I went with slightly taller tires for one car, the price difference was about $12 per tire.
Turns out the taller size is the more popular of the 2.

The only way you are going to see any improvement by going to a smaller tire is if you regear to numerically lower ratio.
I think the only way you would see any improvement just going to a smaller tire and changing nothing else is if you delivered mail and all your stop and go covered the distance of some ones yard.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
  Reply With Quote
Old 07-28-2015, 12:04 PM   #17 (permalink)
EcoModding Lurker
 
Join Date: Apr 2011
Location: US
Posts: 60

Peaty - '03 Honda Insight

Jimmy - '07 GMC Canyon 2wd, Extended Cab, SL
Thanks: 15
Thanked 10 Times in 7 Posts
Lots of research - and the decision was made for me!

Well after all that research on tires for my truck it turns out that the decision was made for me! The truck needed tires, and the dealer stated as much so I have been trying to figure out the best tire based on the OEM sizes that were used on the truck to replace the existing tires... What I didn't know is that the wheels on the truck had been replaced with a 16" wheel instead of the stock wheel. And the dealer after talking with me decided that he didn't want to see me driving that truck with those existing tires through part of 7 states to get it home... So he put new tires on the truck for me. The good news is that he appears to have chosen a decent tire. The bad news is that it isn't exactly the tire I would have chosen for longevity or LRR. The tire is bigger than the tire that I was going to put on it in a 15" size, but only slightly. The tires are a 235/70R16 so they are slightly taller than the 225/75R15 that I had planned. So that worked out well as far as RPM and economy.

The bad news is it is more of an All Terrain tire, and not what I would have preferred. But I got new tires in the deal and that is always a good thing. Leaves more money for other projects and mods that are needed. So overall I am pretty happy, RPM's at 65mph are about 2150. Of course the speedo and odometer are off. The factor I am using is 1.0833 as the multiplier for miles and economy. So far it looks good. Thanks for your input. I like having the larger wheels on the truck and the larger tire helped on the highway where I will use the truck most often so it is a great fit.
  Reply With Quote
Old 07-28-2015, 09:07 PM   #18 (permalink)
EV convert
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 9,615

Sub - '84 Chevy Diesel Suburban C10
SUV
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)

Snow flake - '11 Nissan Leaf SL
SUV
90 day: 141.63 mpg (US)
Thanks: 228
Thanked 3,138 Times in 2,457 Posts
Don't let anyone else pick your tire for you.
They are likely going to pick the tire that benefits them the most.
Go some where like tirerack get the exact tire that meets your needs and have a tire shop put them on.

If you don't think you need an AT tire don't get them. I put Yokohama 31x10.5R15 AT/S tires on my suburban back in 2010. They are a great tire, but they are more than I need.
I wished I had gone with a highway tire. (yoko HT/S in that size)

2100RPM at 65mph sounds high. Unless its a tiny 4 cylinder.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
  Reply With Quote
Old 07-28-2015, 09:08 PM   #19 (permalink)
EV convert
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 9,615

Sub - '84 Chevy Diesel Suburban C10
SUV
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)

Snow flake - '11 Nissan Leaf SL
SUV
90 day: 141.63 mpg (US)
Thanks: 228
Thanked 3,138 Times in 2,457 Posts
Quote:
Originally Posted by Katmandu View Post
What is BSFC ?
Brake specific horsepower consumption.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
  Reply With Quote
Old 07-28-2015, 09:17 PM   #20 (permalink)
Master EcoModder
 
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,020 Times in 1,303 Posts
Brake Specific Fuel Consumption.

https://en.m.wikipedia.org/wiki/Brak...el_consumption

regards
mech

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com