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Discussion Starter · #1 ·
All of a sudden my MPG has dropped by 10mpg at cruise. I used to get 60 at 50mph. Now it's 50 at 50. Only major change was a new set of Walmart Goodyear assurance tires in stock size.
Is that the probable cause? We're the Oem Tires that much better?! Or is there a checklist to go through to find an issue? I'm at 55k miles. Mpg got worse at 45k along with the tire swap.
Any ideas?
 

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From personal experience Walmart sets the tire pressures low. They have set pressures for each rim size. I'd take a look there if you haven't already.
 

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Discussion Starter · #3 ·
From personal experience Walmart sets the tire pressures low. They have set pressures for each rim size. I'd take a look there if you haven't already.
Oh yeah first thing I do is set my own pressure.
That was 10k miles ago so I've pumped it up a few times.
 

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My wife had a set of those put on, I wasn't happy about it but the car needed tires and one got hole too big to patch and it was Sunday.

I've been pretty impressed with them so far. They are quite and got some of the mpgs back that we lost with the last set of off brand tires she had. No problems in the rain at speed either. I run them at 45psi and had them rotated yesterday and they came back at 37psi. They are a tad bit more comfortable on the half mile of bad road we have to take everyday, but the 50 mile avg was about 5mpg from where I was expecting it to be.
 

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Discussion Starter · #9 ·
It is Walmart. Did they put the Assurance Fuel Max back on or plain Assurance?
I bought the non fuel max.
I didn't think tires could add 10mpg and still don't.
I cleaned my map sensor and will monitor it. I'll know on my first drive if that was it.
 

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The tires that originally came with the diesel Cruze will yield you the best milage. You will lose milage with just about any other tire due to weight and tread compound. Matter of fact the OEM TPC rated FuelMax tires on our cars are different then the retail version. I can guarantee the tires are the cause of your lost milage.
 

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The tires that originally came with the diesel Cruze will yield you the best milage. You will lose milage with just about any other tire due to weight and tread compound. Matter of fact the OEM TPC rated FuelMax tires on our cars are different then the retail version. I can guarantee the tires are the cause of your lost milage.
Not all of it. The OEM Fuelmax tires only add about 3-5% to the car's efficiency. Something else is at work here and I suspect it's the MAF sensor as we've seen this sensor cause up to 10% drop in efficiency when dirty.
 

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According to CR the Cinturato P7 All Season Plus should give better fuel mileage than the Assurance Max.
It is rated as the lowest rolling resistance tire in our category of tires. They weigh exactly the same. Dia is .2" larger, I would have to put a pair on and test.
 

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Discussion Starter · #14 ·
I saw about 3mpg from cleaning the MAP sensor. I'll try cleaning the MAF.
I'm noticing a larger than normal swing in mpg at cruise. I'm seeing 5-15 mpg swings on mostly flat road now.
That is not a tire problem to me.
 

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That's exactly a tire problem. They don't roll quite as well and they weigh more so it takes more power to turn them.

That could also have a little something to due with the weather. I don't notice it much in the CTD, but my Beetle TDI looses a noticeable amount of power in the afternoon when its 100 degrees. It only started with 90hp so even 5hp is a significant drop. The CTD is deleted and tuned and i don't really need all the power it has to get around.
 

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The tires that originally came with the diesel Cruze will yield you the best milage. You will lose milage with just about any other tire due to weight and tread compound. Matter of fact the OEM TPC rated FuelMax tires on our cars are different then the retail version. I can guarantee the tires are the cause of your lost milage.
That is an opinion.
I'm telling you. the Pirelli Cinturato Strada AS from Discount Tires are wonderful, ride better, are quieter, and are delivering slightly better mileage than the OEM Goodyears did. This is my second set of Pirellis. My first was on my Sonic 1.4T Hatch, and they really woke that car up in the corners. I believe these are the P7s, but numbered for Discount only.
 

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That is an opinion.
I'm telling you. the Pirelli Cinturato Strada AS from Discount Tires are wonderful, ride better, are quieter, and are delivering slightly better mileage than the OEM Goodyears did. This is my second set of Pirellis. My first was on my Sonic 1.4T Hatch, and they really woke that car up in the corners. I believe these are the P7s, but numbered for Discount only.
According to CR they have less rolling resistance than the fuel max. (Pirelli Cinturato)
 
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