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Old 08-09-2011, 10:32 PM   #1
hitmoninfinity
 
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Help! I'm only getting 320 miles a tank!

I recently got new tires and wheels. The drop in mpg seems to have started around the same time. I'm not sure if that's the cause though. Both the tires and wheels are the same size as before. Does anyone know what the stock steelies weigh? My new rims weigh 17lbs each.

But now that I think about it, I think I was only getting 330-340 a tank before. I keep seeing all you guys in the 40 mpg range! I'm not a diehard mpg junkie, but I do drive pretty reasonably. Enough to be appalled when driving with anyone else. What can I do to get up towards 40 mpg?

Has anyone had to replace an O2 sensor yet? -Did it make a difference?
Is there any other maintenance issues I might be overlooking?

It's a 07 sedan with 50k on it.
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Old 08-09-2011, 11:03 PM   #2
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330miles is about right for in-city driving and not caring about economy so much

if you want 40mpg, you have to drive like a pussy
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Old 08-10-2011, 12:07 AM   #3
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I also found that getting new tires killed the MPG by about 3. Softer tread,even though it was the same size and all, made a big diff in the MPG. Got a quieter smoother ride with the new tires. Maybe bump up the tire pressure a bit?
320's not bad at all.
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Old 08-10-2011, 01:13 AM   #4
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Some people get 40 mpg however some people are also blowing some out their ass...just sayin.
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Old 08-10-2011, 01:22 AM   #5
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Some people get 40 mpg however some people are also blowing some out their ass...just sayin.
I don't doubt that. But I still think I could be doing better.
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Old 08-10-2011, 01:44 AM   #6
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I have a 2007 Toyota Yaris S, if you keep lock the cruise control at under 3,000 (68 MPH) the car will do 40+ MPG all day. I have 185,300 on my car and still do 41 to 42 on my 60 miles work commutes on the interstate. Seriously planning to pick up a 2nd Yaris here before they change them up, hate the style of the new ones, Im learning about.
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Old 08-10-2011, 01:56 AM   #7
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That's average. If you want those higher numbers, you need to hyper mile.
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Old 08-10-2011, 04:51 AM   #8
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i aggree with ^ I get about 320 also, and I drive like a bat out of hell
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Old 08-10-2011, 09:47 AM   #9
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Hmm, I'm a bit of a speeder and I still get at least 400 to the tank. Maybe it's got something to do with local climate?
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Old 08-10-2011, 10:06 AM   #10
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I don't know about the climate thing. I am in NC and I get 41mpg. I would think my climate isn't that different though I will admit that I drive it really easy.
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Old 08-10-2011, 10:21 AM   #11
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climate and driving style for sure... Hot weather here, and 99% city driving, gives me a maximum of 450km (280mi) per tank. The guys who get 40 MPG "without even trying" probably do a lot of slowish highway miles
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Old 08-10-2011, 11:00 AM   #12
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I get 41-42 mpg, but that's back roads, doing 55mph with the cruise on. When I do city driving, it drops down to low/mid 30's. So your 320 miles sounds about right. As mentioned, maybe add some more tire pressure?
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Old 08-10-2011, 12:17 PM   #13
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http://geology.com/state-map/south-c...a.shtml#relief

Hills!!! <---- will affect gas mileage. And by the looks of it, you have plenty of them...
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Old 08-10-2011, 12:28 PM   #14
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op, check the od (outside diameter) of your new tires and compare it to the od of the stock tires, 185/60r15. if your new od is larger it will show fewer miles than actual. the % difference can be found with online tire calculators.
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Old 08-10-2011, 12:36 PM   #15
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i usually get just over 500 a tank...low 400s when i beat the hell out of the car, like the last tank (42.5mpg)
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Old 08-10-2011, 12:49 PM   #16
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i usually get just over 500 a tank...low 400s when i beat the hell out of the car, like the last tank (42.5mpg)
NERD.
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Old 08-10-2011, 04:24 PM   #17
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service your car
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Old 08-10-2011, 04:40 PM   #18
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I did get close to 40 boosted through the middle states on the way from Alabama to Maine. That was driving @ 10 over the limit. There are honestly too many variables to calculate for driving style, climate, and altitude. I know that I get better mileage here in Maine than in Alabama however there as stated are a BUNCH of variables. Once you get south of Virginia for example the highways/freeways are 70mph for the most part in my experience. Bottom line is Peter hit the nail on the head for the most part. I can tell you that prior to adding any mods, and I do mean any, I was always getting around 40mph highway cruising around 60-65 and still that when on I95 heading back and forth at roughly 70-75. Shrugs...if you want the best mileage you will need to find a good source for a gas station and hypermile like Peter suggested.
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