Mpg
#1
10-26-2009, 04:31 PM
Mpg
onboard computer= 28.9
pencil & paper= 28.2
mph is off too I would assume.
neighbor has a Touring, we bought at the same time. Will do a head to head mph comparison and then against my Grand Marquis.
Will post results
pencil & paper= 28.2
mph is off too I would assume.
neighbor has a Touring, we bought at the same time. Will do a head to head mph comparison and then against my Grand Marquis.
Will post results
#2
10-26-2009, 06:06 PM
Interesting.
My recent trip was a record breaker, for me, with Computer: 33.4 mpg
And pen and paper: 34.246 mpg
However, on most other occasions it is the computer that over estimates that actual mileage.
Another thing you and your neighbor should check is to see if your speedo is reading lower than your actual speed. The speedo is linked to the odometer and both are linked to the fuel estimate.
My speedo error is approximately 4%. It makes a difference...
My recent trip was a record breaker, for me, with Computer: 33.4 mpg
And pen and paper: 34.246 mpg
However, on most other occasions it is the computer that over estimates that actual mileage.
Another thing you and your neighbor should check is to see if your speedo is reading lower than your actual speed. The speedo is linked to the odometer and both are linked to the fuel estimate.
My speedo error is approximately 4%. It makes a difference...
#3
10-27-2009, 09:38 AM
I am on my 5th tank and still off by 1 MPG from the computer to the "Calculator" (Who uses paper and pencil?) 
I couldn't resist.
My driving is 80% city, stop and go. Best for far is 25.5MPG (Calculator).
Its great to hear about these figures in the 30s.
I couldn't resist.My driving is 80% city, stop and go. Best for far is 25.5MPG (Calculator).
Its great to hear about these figures in the 30s.
#4
10-27-2009, 09:45 AM
Remember, the computer MPG is an ESTIMATE, not exact. If you are with 1 mph then you are doing fine. I've found the computer is within 0.1-MPG on average of hundreds of tankfulls. However, I've seen actual the computer to be as much as 2-MPG high to 2-MPG low. It's never going to be exact because when you fill your tank it's not exact.
Last edited by NovaResource; 10-27-2009 at 09:52 AM.
#5
10-27-2009, 10:03 AM
I happy to find a group that likes to chat about this stuff since my better half thinks I am a geek for trying to figure this stuff out. She drives a Dodge Magnum RT with a Hemi.
#6
10-27-2009, 10:13 AM
Not to worry, there are pleanty of automotive "nerds" here. LOL! But, you gotta love a woman that drives a Hemi!
#7
10-27-2009, 02:16 PM
A woman who drives a wagon and a hemi is a keeper
The driving I do is 85% highway therefore that would explain the great mileage. Also, when I refill, my Range usually indicates between 375 - 381. Williama, I would suggest that you check to make sure you're getting a full tank load.
Another difference in my driving has occurred lately. I'm no longer the proverbial lead foot -- I use CC as much as possible and don't pass 70 mph, in fact I'm usually closer to 65 mph.
This is a new page in my book and I don't know how much of this I can put up with!!
Also, Williamam, when I drive in the city I do not pass 2500 rpm -- even in San Francisco, and my gas mileage is happily maintained.
Try and make a few changes in the way you drive and you'll likely see a spike in your economy.
The driving I do is 85% highway therefore that would explain the great mileage. Also, when I refill, my Range usually indicates between 375 - 381. Williama, I would suggest that you check to make sure you're getting a full tank load.
Another difference in my driving has occurred lately. I'm no longer the proverbial lead foot -- I use CC as much as possible and don't pass 70 mph, in fact I'm usually closer to 65 mph.
This is a new page in my book and I don't know how much of this I can put up with!!
Also, Williamam, when I drive in the city I do not pass 2500 rpm -- even in San Francisco, and my gas mileage is happily maintained.
Try and make a few changes in the way you drive and you'll likely see a spike in your economy.
#8
10-28-2009, 09:10 AM
Thanks for the tip about keeping it under 2500 RPM. I've been keeping it under 3000 RPM for my city driving. I'll try that and will post results next week.
#9
10-28-2009, 01:44 PM
Also, try and fill up gas either early morning or in the evening, after the sun goes down. This is due to the slightly more condense nature of gas when it is cooler.
Everytime I fill up, the range states 375-388 miles to the tank...this is a great indicator of how full my tank is. Also, I recently broke into 417 miles with 12.2 gallons with 1.8 gallons more to go...enjoy hyper-miling.
#10
10-28-2009, 01:55 PM
http://urbanlegends.about.com/od/aut...umping_gas.htm
1. Fill your tank in the morning when the temperature is cooler so you get more volume for your money.
The basic science behind this is correct. Liquids expand as they warm. The figure usually cited for gasoline is about a 1% increase in volume per 15-degree rise in temperature. Therefore, if you buy 20 gallons of gas at a 90-degree temperature, due to expansion you end up with about 2% less product for your money than you would have gotten had you pumped 60-degree gasoline. At a retail price of $3.00 per gallon that differential would cost you $1.20. The thing is, given that the gasoline is pumped from huge underground tanks wherein the temperature is less variable than that of the outside air, it's very unlikely you would encounter a 30-degree variance in fuel temperature in a 24-hour period. In fact, says a physicist interviewed by KLTV News in Jacksonville, over the course of a day the fuel temperature probably varies no more than a scant few degrees, so the actual savings from pumping in the morning would likely amount to only a few cents per fill-up.
The basic science behind this is correct. Liquids expand as they warm. The figure usually cited for gasoline is about a 1% increase in volume per 15-degree rise in temperature. Therefore, if you buy 20 gallons of gas at a 90-degree temperature, due to expansion you end up with about 2% less product for your money than you would have gotten had you pumped 60-degree gasoline. At a retail price of $3.00 per gallon that differential would cost you $1.20. The thing is, given that the gasoline is pumped from huge underground tanks wherein the temperature is less variable than that of the outside air, it's very unlikely you would encounter a 30-degree variance in fuel temperature in a 24-hour period. In fact, says a physicist interviewed by KLTV News in Jacksonville, over the course of a day the fuel temperature probably varies no more than a scant few degrees, so the actual savings from pumping in the morning would likely amount to only a few cents per fill-up.