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Just thought I'd pass along that once again the Spring effect is kicking in, my V50's average fuel economy is headed back toward 25. My 6MT AWD has averaged 22.5mpg since new (17K miles) and it swings from a little below in Winter, to well above in Spring. The seasonal effect is very noticeable!<p><IMG SRC="http://users.rcn.com/tmtalpey/V50/64665.jpg" BORDER="0"><p>I keep fuel and mileage stats on my Treo with an app called Automobil. (<A HREF="http://www.linkesoft.com/automobil/" TARGET="_blank">http://www.linkesoft.com/automobil/</A>) There are others but I've used this one for a long time. The best tankful so far yielded 28mpg, the worst 18. In this graph, the green horizontal line is the overall average, the dark blue one is the rolling average, and the jaggy one the actual.<p>You can clearly see the break-in effect as the engine loosens up and the ECU decides it's ready. That little uptick was in April 2005, at about 4200 miles. Same thing happened on our XC90, but at about 3200.<p>Thought this data might be interesting to some. <p>Tom.
 

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Re: Ah Spring, when the mpg rises... (tmtalpey)

I chart mine using Excel. Mostly 50/50 hwy/city with quite few road trips. You can pretty much tell when I took the road trips. I'm at 25k miles now.<p> <IMG SRC="http://s40turbo.com/images/misc/volvoMpg.gif" BORDER="0">
 

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Re: Ah Spring, when the mpg rises... (volvoNB)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>volvoNB</b> »</i></TD></TR><TR><TD CLASS="quote">I chart mine using Excel. Mostly 50/50 hwy/city with quite few road trips. You can pretty much tell when I took the road trips. I'm at 25k miles now. </TD></TR></TABLE><p>I am the Bizarro volvoNB -- we got our cars at pretty much the same time, and I just crossed 7,600 miles. No prizes for guessing whether I'm getting better or worse economy than you. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0">
 

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how strange, I was going to post a thread whether anyones MPG was changing.<p>Mine has changed a fair bit... I was getting 22 mpg roughly on average since i got the car.<br>Its now gone up to 24.5 for the last month or so and thats with the same journies day in day out. (and speeds!)<p>On the highway/motorways, i was getting around 24 but now, i get 27.9
 

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All our gas around here has 10% ethanol added now...will this lower my MPG? My driving hasn't been consistent enough to draw any conclusions. Thanks!
 

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Re: Ah Spring, when the mpg rises... (mullmann)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>mullmann</b> »</i></TD></TR><TR><TD CLASS="quote">No prizes for guessing whether I'm getting better or worse economy </TD></TR></TABLE><br>By the way, have you ever asked your dealer to diagnose whether your oxygen sensors are working within margin, and/or checked for manfold air leaks? These are two things that can (greatly) affect mpg. The O2 sensor diagnostics are relatively easy for a dealer to perform.<p>Seven - yes, ethanol formulations will reduce mpg, because ethanol has less energy per unit of fuel volume. However, many factors affect the final result, and some cars don't change much at all. You'd need to track fairly carefully to tell.<p>Tom.
 

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Re: (Seven)

JOHN - Yes, 10% ethanol should drop your mpg a bit. The alcohol does not have the BTU energy gasoline has so You have to burn more of it to make the required HP to move Your car. It will be slight and may not be noticable at all. We've discussed all the reasons MPG drops in colder weather before here. My S40 used to cruise at 75 around 29-30 MPG but since it's been warmer the last couple weeks I've gotten around 31-32 and the computer shows 34+ after resetting last night when I bought gas.
 

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A question for all you freaks ... err, enthusiasts who keep track of your MPG via your Palms and excel spreadsheets <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0"><p>How close are your calculations to that of the onboard computer? The onboard computer tells me my current MPG agerage is 27. Just curious as to how accurate it is.
 

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Re: (fdisker)

Last night, for the FIRST TIME.... The computer and My hand calculation matched, 32.2 mpg. Normally Mine is off up to 1.0 mpg.... but it can be off either direction. The MPG I put in My log is the hand calculation. I log the date, odometer reading, gallons, Dollars, and MPG.
 

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Re: (fdisker)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>fdisker</b> »</i></TD></TR><TR><TD CLASS="quote">The onboard computer tells me my current MPG agerage is 27. Just curious as to how accurate it is.</TD></TR></TABLE><p>Sorry to say your car is actually getting 16.2mpg. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/rolleyes.gif" BORDER="0"> Yep. Definitely.<p>This enthusiast's computer typically reads about 5-10% high. Right now, it's saying 24.8 while my recent tanks together yielded 23.3.<p>Tom.
 

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Re: Ah Spring, when the mpg rises... (tmtalpey)

22.5 mpg is what I get when I'm driving very aggressively in the city; 24mpg when driving the speed limit with avg accel; and lately with higher gas $$ I've been pulling 25.2mpg by taking it easy and running around in 6th gear when cruising in the city.<br>That 3mpg bump has been nice, an extra 35miles per tank when I take it easy is another two days going to work.<p>By the way I'm at about 15K miles now on mine.
 

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Re: Ah Spring, when the mpg rises... (warmonger)

I have a 2005 S40 T5 AWD and kept track of my fuel consumption for the first complete year of ownership. I live in Alaska and run Bridgestone Blizzaks (205/55R/16) from October through April and just installed Michelin Pilot Sport All Seasons (225/45ZR/17) for the summer. The first year I drove 17,816 miles, used 751.77 gallons of gas (23.69 Average MPG) with a total cost of $1,891.76. My daily driving is a mix of city/highway.
 

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Re: (fdisker)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>fdisker</b> »</i></TD></TR><TR><TD CLASS="quote">A question for all you freaks ... err, enthusiasts who keep track of your MPG via your Palms and excel spreadsheets <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0"><p>How close are your calculations to that of the onboard computer? The onboard computer tells me my current MPG agerage is 27. Just curious as to how accurate it is.</TD></TR></TABLE><p>Here is a snippet of my data:<p>Actual vs Computer<br>22.83712785 24.6<br>24.7140582 24.8<br>22.84375666 24.7<br>24.21824629 24.8<br>22.01654747 24.3<br>24.68340846 25<br>22.59417476 25.2<br>23.20082755 24.8<br>27.89075256 29.3<br>21.97700164 23.5<br>24.16437563 24.3<br>22.12188011 25.4<br>23.79312983 25.1<br>29.06057251 29.5<br>24.39524996 26.2<br>22.35402756 25.1<br>23.47714834 25.3<br>22.80116419 24.2<br>21.04684407 23.5<br>24.40956541 24.2<br>24.97215593 26.3<br>27.75141589 29.3<br>25.25007578 28.9<br>22.57387247 24<br>23.96062044 24.6<br>20.91254753 23.8<br>27.13774064 27.3<br>25.94285714 28.6<br>25.24129411 26.5<br>20.97829319 23.5<br>23.00931099 23.9<br>22.35336452 23.4<br>27.3061899 29<br>27.68253482 28.4<br>
 

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Re: (volvoNB)

As we've discussed in other threads, these cars are really difficult to fill accurately. For those of you that keep detailed records, how do ensure you are filling your tank to the same level each time? volvoNB, I seem to recall that you even try to use the same gas pump for each fill, although I've found the problem to be more with the car than the pump. How do you guys control this variable?
 

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Re: (mullmann)

I don't bother. The mileage of a single tank is uninteresting, the long-term consumption is. The variations come out in the wash.<p>Tom.
 

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I just completed my 1st "long" drive that consisted of strictly highway and no city traffic. Car averaged 30.3 mpg. I normally get about 22 mpg in a mix of city and highway driving. I'm pretty satisfied.
 

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Re: (mullmann)

I've read in another thread where someone said that it takes some time for the reserve to fill up. Knowing this, I use a few methods.<p>* Set the pump to fill slowly and at the slowest setting when 2 gallons from full. <br>* Fill up right when the low fuel light comes on. I'm guessing this is when the reserve is kicking in.<br>* Fill it normally and let it auto shut off. Wait about a minute and top off. <p>The methods seem to help be more consistent but it still varies.
 

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Re: (littlezipp)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>littlezipp</b> »</i></TD></TR><TR><TD CLASS="quote">Our cars don't actually have a reserve tank right?<br>Your just talking about the last couple gallons?</TD></TR></TABLE><p>Yeah, you're right. We don't have a reserve tank. There is another tank inside the fuel tank that keeps the pump submersed in fuel. When the fuel gets low, the inner tank is sealed off so the big tank is used first. Once the big tank is drained, the inner tank start getting used. It is this inner tank I think is harder to fill. <p>In my mind I think of it as a reserve tank. Sorry for the confusion.
 
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