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Did you read the article? Particularly, the part where they measured the temperature of fuel delivered in California and found it consistently above the temperature the pumps are calibrated for? It's not about day-to-night or summer-to-winter variability.
It may be true that soil temperature is nearly constant, but that's not terribly relevant. The underground storage tanks at filling stations are so large (typically 25,000 gallons) that the surface area-to-volume ratio is very high, giving the soil temperature little influence on the fuel temperature. They're also emptied & refilled frequently, giving any given gallon of fuel little residence time for heat transfer, and modern tanks are double-walled, (for leak detection) providing an insulating air space between the fuel and the soil.
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Douglas Campbell, P.E.
1986 Isuzu P'up, 177,673.8 miles.
- Hella headlights (highly recommended)
- DOT C-2 back end (also recommended)
- R-12 air conditioner converted to R-406a. Saved ozone and money
- 4.1:1 final drive converted to 3.4:1. Quieter, better mileage but it's a good thing I live in the flat Midwest.
- 9/22/2007, age 21: Still running well when reluctantly sent away for reincarnation, due to body & frame rust.
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