6-7 mpg
Elder User
Joined: Jun 2005
Posts: 547
Likes: 2
From: Darien
The outside temp kills my mileage bopping around town when it is cold. I had barely 10mpg the last cold snap. Looks like this cold weather here now is killing my mileage again. 70 miles and -1/3 a tank gone. A couple days ago about 18*F out I got exactly 14.69mpg all interstate travel. It just might be cold and short trips for you also?
Cool, I can drive it like I stole it and make no less than 11mpg! 
Originally Posted by Fredvon4
All 2v and 3v V10 that are working properly get 11-14 MPG ( average 12.5MPG) at cruise RPM (2100@70MPH) when empty no matter how much or little you preform hard acceleration starts from a standing stop.
Last edited by lariat79sc; Jan 28, 2007 at 09:32 PM.
Senior User
Joined: Apr 2005
Posts: 120
Likes: 0
From: Pensacola, FL
Mine's a bummer!
I need some comments ref mine.Just turned 7K and for the last 1,000 miles or so have noticed a little less punch and getting 10mpg max around town (not goosing it or really driving aggressively). When I was under the "magic" 150 engine hours, I was getting 8-8.5 when towing my 10k fifth wheel, and now it has dropped to 6.8 towing on level terrain. Ouch!
I really expected improved fuel consumption.
Sugestions..............
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Joined: Jan 2007
Posts: 9
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Originally Posted by MuddyAxles
Maybe it's me, but I'm a little confused. Before you can be sure your odometer is accurate, you have to compare it to a known mile. One mile isn't enough, however.
Do you ever drive on an interstate that has mile markers? Now, there's no guarantee they are accurate unless you see one marked "measured mile", which are pretty rare. What I do is note the miles and tenths at a given milepost and watch it until I pass the tenth milepost (start at mp 6, end at mp 16, for instance). Note the miles and tenths again. Subtract first reading from the second and divide by 10. Whatever that number is equals what your odometer says is a mile. If that number =1, you are right dead on, your odo is correct. If it doesn't come out to 1, or very close to 1, you have an error to factor in. If the number you come up with is less than one, all your mpg calculations will read lower than they really are. If more than one, you'll get a false high reading.
If you really want to get into this, read this next paragraphs, if not, skip the next two.
If the number you got after dividing by ten is, say .92 (this will be our example for now), you can still get your REAL mpg by taking all your miles (or mpg's, but not BOTH) and dividing either the miles or mpg's by .92 (easiest done on a calculator). If you like to multiply instead take your .92 and for one time only, divide the number 1 by .92 and then you'll have a number you can jot down to multiply all your future mpg calculations with. In this example I have given you, all your future calculations will be multiplied by 1.08696, so all your mpg's will grow by 8+%. If your mpg's are 8.8 calculated, the real mpg's are 8.8 x 1.08696 = 9.565.
If the number you got after dividing by ten was over one your odo is reading more miles than you are really travelling. If the number was, say 1.13, the odo is showing 13% more miles than truly travelled. To get that easy "multiplying number", take one and divide by what you got, say 1.13. 1/1.13gives you .885. Multiply all your mpg calculations by .885 and the answer is your true mpg's. If you had 17.5 before, your real mpg's are 15.49. It's easy once you get used to it.
I hear some folks who come up with some far out mpg calculations. I have done this for years and the only truly accurate way is to keep track of your fill-ups all the time. Then you know if and when it is rising or falling.
Most of us probably know this, but for those who don't or forgot:
When calculating miles per gallon (and I've done it with kilometers per liter AND figured how to easily convert it to mpg's as well and converted cost from the old DM's to US $ too!) you have to know where you are starting, so it has to start with a full tank of fuel, there's no other way without expensive metering equipment. You're going to use two meters that come for free, well mostly free anyway. The meter on the pump and the meter in your dash, which you have already tested for accuracy, I hope.
Fill the tank the way you usually do. Try to do this pretty much the same way every time because this is where huge variations can come (the smaller the tank, the bigger the variation when filling inconsistently).
You can jot down the gallons if you want, but for all practical purposes, the gallons now are meaningless. Do record the miles on the odometer!
At the next fill-up, try to fill the same way as before. Do write down the gallons and odometer reading now, well, right after you pay for the gas so you don't forget and drive off
! Take today's reading and subtract the miles reading from the previous fill-up. Let's say you drove 153 miles since last fill. Take that and divide it by the gallons AND tenths of a gallon (someone I knew rounded all the gallons before dividing...now why go to all this trouble to get a bogus number?) Say it took 17.5 gallons: 153/17.5 = 8.74 miles per gallon. That is the ONLY way I know of to get a good mpg reading.
Now, if you determined that your odometer was off by 8+% as we did in the first example, take CALCULATED mpg's and multiply by 1.08696 (or 1.09, here you can round it up OK) and you get 9.5 (or 9.5266 if you rounded to 1.09) to give you your REAL miles per gallon reading.
Sounds too complicated but once you do it a few times, you'll be a whiz at it.
Dave aka MuddyAxles
Do you ever drive on an interstate that has mile markers? Now, there's no guarantee they are accurate unless you see one marked "measured mile", which are pretty rare. What I do is note the miles and tenths at a given milepost and watch it until I pass the tenth milepost (start at mp 6, end at mp 16, for instance). Note the miles and tenths again. Subtract first reading from the second and divide by 10. Whatever that number is equals what your odometer says is a mile. If that number =1, you are right dead on, your odo is correct. If it doesn't come out to 1, or very close to 1, you have an error to factor in. If the number you come up with is less than one, all your mpg calculations will read lower than they really are. If more than one, you'll get a false high reading.
If you really want to get into this, read this next paragraphs, if not, skip the next two.
If the number you got after dividing by ten is, say .92 (this will be our example for now), you can still get your REAL mpg by taking all your miles (or mpg's, but not BOTH) and dividing either the miles or mpg's by .92 (easiest done on a calculator). If you like to multiply instead take your .92 and for one time only, divide the number 1 by .92 and then you'll have a number you can jot down to multiply all your future mpg calculations with. In this example I have given you, all your future calculations will be multiplied by 1.08696, so all your mpg's will grow by 8+%. If your mpg's are 8.8 calculated, the real mpg's are 8.8 x 1.08696 = 9.565.
If the number you got after dividing by ten was over one your odo is reading more miles than you are really travelling. If the number was, say 1.13, the odo is showing 13% more miles than truly travelled. To get that easy "multiplying number", take one and divide by what you got, say 1.13. 1/1.13gives you .885. Multiply all your mpg calculations by .885 and the answer is your true mpg's. If you had 17.5 before, your real mpg's are 15.49. It's easy once you get used to it.
I hear some folks who come up with some far out mpg calculations. I have done this for years and the only truly accurate way is to keep track of your fill-ups all the time. Then you know if and when it is rising or falling.
Most of us probably know this, but for those who don't or forgot:
When calculating miles per gallon (and I've done it with kilometers per liter AND figured how to easily convert it to mpg's as well and converted cost from the old DM's to US $ too!) you have to know where you are starting, so it has to start with a full tank of fuel, there's no other way without expensive metering equipment. You're going to use two meters that come for free, well mostly free anyway. The meter on the pump and the meter in your dash, which you have already tested for accuracy, I hope.
Fill the tank the way you usually do. Try to do this pretty much the same way every time because this is where huge variations can come (the smaller the tank, the bigger the variation when filling inconsistently).
You can jot down the gallons if you want, but for all practical purposes, the gallons now are meaningless. Do record the miles on the odometer!
At the next fill-up, try to fill the same way as before. Do write down the gallons and odometer reading now, well, right after you pay for the gas so you don't forget and drive off
! Take today's reading and subtract the miles reading from the previous fill-up. Let's say you drove 153 miles since last fill. Take that and divide it by the gallons AND tenths of a gallon (someone I knew rounded all the gallons before dividing...now why go to all this trouble to get a bogus number?) Say it took 17.5 gallons: 153/17.5 = 8.74 miles per gallon. That is the ONLY way I know of to get a good mpg reading.Now, if you determined that your odometer was off by 8+% as we did in the first example, take CALCULATED mpg's and multiply by 1.08696 (or 1.09, here you can round it up OK) and you get 9.5 (or 9.5266 if you rounded to 1.09) to give you your REAL miles per gallon reading.
Sounds too complicated but once you do it a few times, you'll be a whiz at it.
Dave aka MuddyAxles
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