|
|
|
#1
|
||||
|
||||
New tires and mileage dropped.
After putting 4 new Good Year tires on my wife's Prius her mileage dropped 4 Mpg.The size is the same as the OEM tires. Is it possible that the diameter is larger?
|
#2
|
|||
|
|||
Possible, check the indicated speed against a gps.
Is the tire pressure correct? |
#3
|
||||
|
||||
Over how many miles is this calculated?
There are several factors that could make the mileage drop a few points. I would check the tire pressures, and also find out if they are low rolling resistance tires.
__________________
-Justin 91 560 SEC AMG - other dogs dd 01 Honda S2000 - dogs dd 07 MB ML320 CDI - dd 16 Lexus IS250 - wifes dd it's automatic. |
#4
|
||||
|
||||
Good idea.
|
#5
|
||||
|
||||
After 400 miles i would get 43.5 mpg. Now it is down to 37.7 mpg.
|
#6
|
|||
|
|||
Maybe your older tires were nitrogen filled
__________________
1992 300CE BilsteinSport Vogtland Borla EuroLampsAllAround 3pc18" Staggered BRABUS Monoblock IVs http://i95.photobucket.com/albums/l1...MG00656Sig.jpg FS/FT: 17" OEM 6-Spoke Wheels FS/FT: 16" Lorinser RS-90s FS: W211 Steering Wheel |
#7
|
||||
|
||||
Lol, When I first read this I wasn't sure what car we were talking about. I skimmed past it in the original post. I checked your sig and though you were talking about the 420.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#8
|
||||
|
||||
I would think that would improve your gas mileage.
Unless your MPG comparisons are based on strictly controlled driving conditions, it's difficult to say that the tire swap had anything to do with it...although I concur with the possible change in the rolling resistance of the new tires. Hotter weather requires more A/C usage...not to mention the engine works harder as well. New tires grip better, giving a more confident road feel...and perhaps more aggressive driving and heavier pedal. More stop-and-go driving this time around versus prior to the tire change?
__________________
2009 ML350 (106K) - Family vehicle 2001 CLK430 Cabriolet (80K) - Wife's car 2005 BMW 645CI (138K) - My daily driver 2016 Mustang (32K) - Daughter's car |
#9
|
||||
|
||||
The OE tires are special low rolling resistance tires- Are the new ones as well, or are they just standard tires in the appropriate size?
|
#10
|
||||
|
||||
You can't really go by one tank, you need to average at least 3-4.
Check the pressures to, you don't know what the tire shops set them to. I find its usualy pretty low.
__________________
1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200 |
#11
|
|||
|
|||
If you installed Triple Treds, You definitely lost mileage. They're a heavy tire & cause mileage drop. I know that from my running a Goodyear store & personal experience. Easy to check the weight of the tire is to go to tirerack.com. Look up your previous tire & the new tires and check the spec page on both. Willing to bet money I don't have that they're heavier than your OE tires. Unsprung weight is always overlooked - wheels/tires,etc. Of course, check the basics - tire pressure, similr driving conditions ?, etc.
When I got the General Altimax HP's for the Sentra, I compared them. The triple Treds are 4lbs heavier per tire in the same size.
__________________
Sharing my partner's 2012 Forte 5dr SX til I find my next 123 or 126.. - Do I miss being a service advisor ??? |
#12
|
||||
|
||||
Unfortunately i don't know the specs. of the OE tires. They were Good Year.The new tires are also Good Year [Comfort Touring]. I drive the same every day and always drive to get good millage. The old and new tires are not filled with nitrogen. I check the tire pres. once a week and keep them at 35lbs. front and rear. The recommended tire pres. on the car door is 35 front and 33 rear. I don't think that would make a difference. I do think that the new tires are probably heaver.
|
#13
|
|||
|
|||
Quote:
If you go onto tire rack and search for tires by VEHICLE rather than size, it will flag the OE tire and you can click on SPECS and it will display the tire weight, rolling diameter,etc. To easy your search, eliminate all the other brands since Goodyear is both the OE and what you replaced them with. Do you know what model Goodyear tire the new ones are ?
__________________
Sharing my partner's 2012 Forte 5dr SX til I find my next 123 or 126.. - Do I miss being a service advisor ??? |
#14
|
|||
|
|||
I just checked - using 2006 as the model since you didn't post what year, but I do know that they used the same tire for several years so I'm probably spot-on with the size - 185/65R15.
The OE tire weighs 17lbs, actually 1lb lighter than the new "Assurance FuelMax" Low rolling resistance model, yet the "standard" Non-low rolling resistance Fuel Max is lighter than both at 16lbs. EDIT: The Comfort Tred Touring weighs in at 18lbs each - one pound more than you're OE tire. Seems insignificant I know, but it does have an effect. The General Altimax HP's I put on my Sentra to replace the horrible Fuzions that came on it are 3lbs lighter per tire. I went from an average of 31.1 to 33.7mpg after the first tank, driving the same route, in the same manner, every day and has remained consistent in the 33.6-34.1mpg average.
__________________
Sharing my partner's 2012 Forte 5dr SX til I find my next 123 or 126.. - Do I miss being a service advisor ??? Last edited by AdvisorGuy; 07-09-2010 at 08:49 PM. |
#15
|
||||
|
||||
Check the tire pressure.
My tires were over filled on the right side and my car a dog to drive. Next time I go to Sams Club for my winter tire change I'll check it myself.
__________________
-Typos courtesy of my mobile phone. |
Bookmarks |
|
|