Last post on Sep 24, 2013 at 5:21 AM
You are in the Toyota Prius
What is this discussion about?
Toyota Prius, Tires, Wheels, Hatchback, Sedan
#91 of 163 Wheel Caps vs Wheel Covers
May 03, 2010 (12:32 pm)
Before last winter I purchased a replacement wheel cover and a set of wheel caps for my 2010 Prius 4. I was curious as to why Toyota put plastic wheel covers on aluminum alloy wheels. One hypothesis I had is that is had something to do with improving MPG. I waited until this spring to switch over from wheel cover to caps. Well, after abut 1000 miles I can say that the mpg's have not been affected in any measurable way that I could see. Since I like to look of the alloy wheels the wheel covers are in my garage when the Prius is on the road.
#92 of 163 Re: new tires after 20,000 miles [jlondon2]
May 31, 2010 (9:47 pm)
One reply to this says "who ever told you Priuses are heavy is crazy". Well Priuses are heavier in the front of the vehicle than other compact cars. Hybrids have a gasoline engine, an electric motor, Heavier battery, and a transmission all supported by the front axle. Early Priuses came stock with and required required XL Tires (Extra Load). A tires weight capacity is effected by the size of the tire as well as inflation. Until 2004 Priuses came with 175/65/r14 xl tires with an inflation requirement of 35psi. The mistake Toyota made was that the extra load rating of the tire doesn't kick in until the tire is inflated above 38 psi. There is no difference between an xl tire and a standard load tire of the same size at 35psi. Because of this many Prius owners experienced the front tires going bald on the inner and outer edges at low mileage. This wear pattern is classic under inflation wear. (due to the weight of the car) Inflating the tires to 40 to 42 psi puts them at the weight capacity they need to be at to support the weight of the car, but Toyota never admitted to this error because Increasing the required air pressure would change the handling and stability of the car. They corrected it in 2004 by making 15 inch tires standard. The larger tires have a higher load capacity at 35 psi with out requiring an xl rating.
#93 of 163 Re: Wheel Caps vs Wheel Covers [bioman]
Jun 04, 2010 (3:08 pm)
are these 16" wheels? i was looking for replacements for my touring prius...
#94 of 163 Wheel Covers
Aug 12, 2010 (5:28 pm)
I don't get! I have a Prius with 17 in. alloys so this doesn't apply to me, but... Yesterday I saw a 2010 Prius with great looking 15 in wheels and complimented the owner and asked where he got them. I was floored when he said they were under the plastic wheel covers. I drove away thinking he was nuts until I did some research myself. How can this be? Why would Toyota cover up such hot looking rims and waste the money on plastic crap that looks like it was purchased from the Target auto accessories dept? If aerodynamics was the issue, it could be incorporated into wheel design. If protection from damage was intended, then no one would buy custom wheels in the first place. Toyota could have spent the money on DRLs or dual zone a.c. or any number of cheap upgrades. What am I missing?
#95 of 163 Re: Wheel Covers [mbros2k]
Aug 13, 2010 (11:33 am)
I was told the plastic wheel covers are supposed to reduce wind drag on the wheels, giving better fuel economy. I doubt it's ever been proven by anybody though.
#96 of 163 Re: Wheel Covers [mbros2k]
Aug 15, 2010 (5:39 am)
Yes, this is the real deal. I bought a 2010 in October and had even questioned the salesperson about how confusing the sales brochure was concerning alloy wheels and wheel covers. He said he didn't know but would check it out--he didn't and I failed to follow up until I took my car throught a carwash and accidentally hit one of the carwash rails and ended up popping off the wheel cover. I was angry at myself for doing this, but very pleasantly surprised to find the alloy wheel underneath. Needless to say, I popped off the others and now have a great looking set of wheels. The only "fly in the ointment" was that very small center caps for the wheels were needed, but were not there, so I had to buy them from the dealer for close to $70. No gas mileage issue for me. Changed to synthetic oil and averaged 55mpg on my latest 1800 mile trip.
#97 of 163 Poor Gas Mileage after replacing tires
Nov 29, 2010 (10:39 pm)
I have 45,000 miles on my 2007 Prius Touring and needed to replace the tires. There seemed to be plenty of tread left but, because I live in Las Vegas with the extreme heat, the tread started to split. Because I had experienced the high cost of wheel cover replacement before, I decided to get new rims as well. I know, dumb, but I didn't think it would make a difference. The car looks great but my gas mileage has dropped tremendously. I used to get between 46 and 49 mpg (per the car's computer--my calculations are always a little less) and now the high is 43. My current tank is showing 36 mpg. I have NEVER seen it that low before! I also notice that I can't coast as well and I can't "float" the gas pedal to get better gas mileage while still going the same speed.
All that said, what do I do? I might be able to get different tires and go back to my old rims since I got the tires and rims from Discount Tire but what tire do I ask for? I'm very depressed at the drop in mpg. HELP! :
#98 of 163 Re: Poor Gas Mileage after replacing tires [jana26]
Nov 30, 2010 (3:42 am)
First, all other things being equal, new tires should get worse fuel economy than old tires.
Second, if you changed from an OE tire to a replacement market tire, expect a further drop in fuel economy.
Third, if you went after a tire with god treadwear ratings, expect another hit in fuel economy.
Be aware that there is a 3 way relationship between rolling resistance, traction, and treadwear. Rep[eat after me: "There is no free lunch!"
So I'm thinking the problem isn't the rims.
If you want more detail:
#99 of 163 Re: Poor Gas Mileage after replacing tires [capriracer]
Nov 30, 2010 (7:58 am)
TAKE NOTE: The variables that effect milage are many...tires, weather, temperatures, seasonal gas blends, wear & tear, and finally, change in driving habits. I suggest, after 8 yrs with an 04 Prius with 133 plus thousand miles, milage is going to vary. Mid summer I always climb back into the upper 40's and expect much less come the harsh winters. Truthfully I find keeping tire pressure up to suggested specs a key point. I once saw what a massive head wind can do to milage on a trip from Indiana to western Iowa. I got 31mpg and on the return 51mpg. What a difference that can make. So, what I'm suggesting is simply consider ALL the issues when it comes to MPG's.
#100 of 163 Re: Poor Gas Mileage after replacing tires [capriracer]
Dec 02, 2010 (2:26 pm)
Thanks for the info. Sorry for not getting back to you before this--work/computer issues. Sounds like I got hit with all three issues. That'll teach me! At least the rims aren't part of the problem. They are alloy too and do make the car look awesome! I stopped back at Discount Tire today and talked to them about the tires. They claimed they had never had anyone complain before but were "appreciative" of my comments. They checked their computer but couldn't find any tire that listed anything about tire and gas mileage for the Prius. They actually asked me to let them know what tires would be good for the Prius. Toyota had told me that Goodyear makes a tire they use for the Prius but I can't remember what the name was. See what happens when you get non-young! (I prefer not to use the "O" word any more!
Again, thanks and if you know of a good tire, I'd appreciate the info.