Gas mileage increasing with higher miles...
#1
04-08-2006, 02:28 PM
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Gas mileage increasing with higher miles...
I was wondering if anyone else has noticed that the higher the miles, the better the mpg. I haven't changed my driving style at all since I bought my truck new in 2004. It is a quad cab hemi 4x4 with 3.92 gears and 20" wheels. 60 to 70 percent of my miles are interstates, I set cruise at about 65 mph. 20 to 30 percent are highway, I travel 55 mph. 10 to 20 percent are towns and township backroads, traveling like 30 or so mph. I accelerate fairly slowly, and as you can see my mph's are fairly conservative. When the truck was new, I was getting around 10 to 11 mpg. At around 25,000 miles, 11-13 mpg. 50,000 miles, 14 to 15 mpg. Now I have 64,000 miles, and am getting 16 mpg. I always run 89 octane, but don't know if that makes any difference at all. I am happy with my mpg for the amount of power the hemi has. I figure by the time I get to 300,000 miles, at this rate, I should be getting around 50 mpg!!!!! haha Just wanted to share my mpg experience and see if anyone else has the same experience. Great forum here. Thanks for all the info.
#2
04-09-2006, 03:43 AM
RE: Gas mileage increasing with higher miles...
ORIGINAL: dan0617
I was wondering if anyone else has noticed that the higher the miles, the better the mpg. I haven't changed my driving style at all since I bought my truck new in 2004. It is a quad cab hemi 4x4 with 3.92 gears and 20" wheels. 60 to 70 percent of my miles are interstates, I set cruise at about 65 mph. 20 to 30 percent are highway, I travel 55 mph. 10 to 20 percent are towns and township backroads, traveling like 30 or so mph. I accelerate fairly slowly, and as you can see my mph's are fairly conservative. When the truck was new, I was getting around 10 to 11 mpg. At around 25,000 miles, 11-13 mpg. 50,000 miles, 14 to 15 mpg. Now I have 64,000 miles, and am getting 16 mpg. I always run 89 octane, but don't know if that makes any difference at all. I am happy with my mpg for the amount of power the hemi has. I figure by the time I get to 300,000 miles, at this rate, I should be getting around 50 mpg!!!!! haha Just wanted to share my mpg experience and see if anyone else has the same experience. Great forum here. Thanks for all the info.
I was wondering if anyone else has noticed that the higher the miles, the better the mpg. I haven't changed my driving style at all since I bought my truck new in 2004. It is a quad cab hemi 4x4 with 3.92 gears and 20" wheels. 60 to 70 percent of my miles are interstates, I set cruise at about 65 mph. 20 to 30 percent are highway, I travel 55 mph. 10 to 20 percent are towns and township backroads, traveling like 30 or so mph. I accelerate fairly slowly, and as you can see my mph's are fairly conservative. When the truck was new, I was getting around 10 to 11 mpg. At around 25,000 miles, 11-13 mpg. 50,000 miles, 14 to 15 mpg. Now I have 64,000 miles, and am getting 16 mpg. I always run 89 octane, but don't know if that makes any difference at all. I am happy with my mpg for the amount of power the hemi has. I figure by the time I get to 300,000 miles, at this rate, I should be getting around 50 mpg!!!!! haha Just wanted to share my mpg experience and see if anyone else has the same experience. Great forum here. Thanks for all the info.
1. miles driven - this is hard measured data
2. fuel burnt - this is probably estimate/calculation based on PCM data, like throttle position, air flow and maybe some other inputs. I don't believe the computer actually measures amount of gas in the tank.
So while the first input is hard data and correct, the second is just estimate with some degree of error. The more miles you drive the less impact this error has on the result. The error is being averaged out.
That's my guess. I also see this behaviour on my brand new truck with only 900 miles on it. The mpg is slowly creeping up every week.
#3
04-09-2006, 04:41 AM
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#4
04-09-2006, 11:58 AM
RE: Gas mileage increasing with higher miles...
I have noticed the same thing recently. My '02 started getting better fuel mileage at around 160,000 miles. I guess it is just now getting broke in.(Must be the Mobil 1 synthetic oil) I have checked the overhead display with the actual fuel used and it has always been within three tenths of actual. Usually reads low if it is off at all.
#5
04-10-2006, 09:25 AM
