Do you believe your truck's AVG. MPG display?
07-21-2009, 04:06 PM
#21
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"At retail, oil companies buy at one temperature and sell to consumers at another. However, retail sales are not temperature-adjusted. Though technology exists and has
been accepted for near universal use in Canada, no U.S. retailer of gasoline compensates for temperature when selling to consumers. As a result, when temperatures of gasoline rise above the 60 degree standard, as is the case in the U.S. during the summer, the amount of gasoline by weight decreases in a gallon, and the effective price per gallon increases.
For instance, let’s say that Consumer C pumps 20 gallons at Retailer D’s gas station, and assume that the actual temperature of the gasoline is 90 degrees Fahrenheit, and the consumer is paying $3.50 per gallon. Due to the thermal expansion of gasoline, the retailer only had to deliver 19.59 temperature adjusted gallons to make 20 gallons at 90 degrees. The consumer, therefore, paid the retailer a premium on top of his costs for the gasoline and station operation, profit and excise taxes of $1.44. Stated another way, the consumer effectively paid about $3.57 per gallon, not the advertised $3.50."
been accepted for near universal use in Canada, no U.S. retailer of gasoline compensates for temperature when selling to consumers. As a result, when temperatures of gasoline rise above the 60 degree standard, as is the case in the U.S. during the summer, the amount of gasoline by weight decreases in a gallon, and the effective price per gallon increases.
For instance, let’s say that Consumer C pumps 20 gallons at Retailer D’s gas station, and assume that the actual temperature of the gasoline is 90 degrees Fahrenheit, and the consumer is paying $3.50 per gallon. Due to the thermal expansion of gasoline, the retailer only had to deliver 19.59 temperature adjusted gallons to make 20 gallons at 90 degrees. The consumer, therefore, paid the retailer a premium on top of his costs for the gasoline and station operation, profit and excise taxes of $1.44. Stated another way, the consumer effectively paid about $3.57 per gallon, not the advertised $3.50."
Last edited by rich50; 07-21-2009 at 04:11 PM.
07-25-2009, 02:18 AM
#24
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FYI...
Pages 90 & 91 in the manual describe the potential sources of error:
"If you calculate your avg fuel economy by dividing miles traveled by gal of fuel used, your figure may be different than displayed for the following reasons:
-Your vehicle was not perfectly level during fill-up
-Differences in the auto shut off points on the fuel pumps
-Variations in the top-off procedure from one fill up to another
-Rounding of the displayed values to the nearest 0.1 gallon"
Also... Page 378 it states, "We do not recommend taking fuel economy measurements during the first 1,000 miles of driving. You will get a more accurate measurement after 2,000-3,000 miles."
Pages 90 & 91 in the manual describe the potential sources of error:
"If you calculate your avg fuel economy by dividing miles traveled by gal of fuel used, your figure may be different than displayed for the following reasons:
-Your vehicle was not perfectly level during fill-up
-Differences in the auto shut off points on the fuel pumps
-Variations in the top-off procedure from one fill up to another
-Rounding of the displayed values to the nearest 0.1 gallon"
Also... Page 378 it states, "We do not recommend taking fuel economy measurements during the first 1,000 miles of driving. You will get a more accurate measurement after 2,000-3,000 miles."
07-25-2009, 02:30 PM
#25
FYI...
Pages 90 & 91 in the manual describe the potential sources of error:
"If you calculate your avg fuel economy by dividing miles traveled by gal of fuel used, your figure may be different than displayed for the following reasons:
-Your vehicle was not perfectly level during fill-up
-Differences in the auto shut off points on the fuel pumps
-Variations in the top-off procedure from one fill up to another
-Rounding of the displayed values to the nearest 0.1 gallon"
Also... Page 378 it states, "We do not recommend taking fuel economy measurements during the first 1,000 miles of driving. You will get a more accurate measurement after 2,000-3,000 miles."
Pages 90 & 91 in the manual describe the potential sources of error:
"If you calculate your avg fuel economy by dividing miles traveled by gal of fuel used, your figure may be different than displayed for the following reasons:
-Your vehicle was not perfectly level during fill-up
-Differences in the auto shut off points on the fuel pumps
-Variations in the top-off procedure from one fill up to another
-Rounding of the displayed values to the nearest 0.1 gallon"
Also... Page 378 it states, "We do not recommend taking fuel economy measurements during the first 1,000 miles of driving. You will get a more accurate measurement after 2,000-3,000 miles."
07-28-2009, 02:21 PM
#26
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My KR 4x4 gets about 1 mpg less when I calculate the actual over 3 tanks vs. the gauge calculation on the odometer. I only use it as an indication of how I'm doing on that tank of gas.
07-31-2009, 11:08 PM
#27
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Redid the measurement after a long trip and the computer is above again by ~0.9 mpg. That does seem to be a fairly large discrepancy which I find is odd because I have had other vehicles that were spot on between my manual measurement and the computer's. I calculated 17.9 and the computer was at 18.8.
