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Actually, you should get more mpg from cold gas than from hot. let's say you have 20 gallons of gas at room temperature. Due to the coefficient of expansion, if you cool that to 30 degrees, it will contract to 19 gallons, and you can get one more gallon into your 20-gallon tank, which will increase the distance you can drive on a tankful by 5%. So 19 gallons of cold gas will take you as far as 20 gallons of hot gas. Because it has exactly the same amount of potential energy, but takes up less space, and we calculate mileage by the volume of the gas, which varies by temperature. (I have no idea what the actual coefficient of expansion is, but it is significant enough to expand quite a bit out onto the ground if you fill up to the brim with cold gas on a hot day.)
I just checked on that, and found this interesting observation: http://www.consumerwatchdog.org/reso...lUSAJune07.pdf
Wholesale gasoline prices are adjusted to 60 degrees, so during the summer, motorists will pay $1.5 billion too much for expanded gas.
Gasoline expands about 4.5 times as much as water does.
Actually, you should get more mpg from cold gas than from hot. let's say you have 20 gallons of gas at room temperature. Due to the coefficient of expansion, if you cool that to 30 degrees, it will contract to 19 gallons, and you can get one more gallon into your 20-gallon tank, which will increase the distance you can drive on a tankful by 5%. So 19 gallons of cold gas will take you as far as 20 gallons of hot gas. Because it has exactly the same amount of potential energy, but takes up less space, and we calculate mileage by the volume of the gas, which varies by temperature. (I have no idea what the actual coefficient of expansion is, but it is significant enough to expand quite a bit out onto the ground if you fill up to the brim with cold gas on a hot day.)
I just checked on that, and found this interesting observation: http://www.consumerwatchdog.org/reso...lUSAJune07.pdf
Wholesale gasoline prices are adjusted to 60 degrees, so during the summer, motorists will pay $1.5 billion too much for expanded gas.
Gasoline expands about 4.5 times as much as water does.
Actually, you should get more mpg from cold gas than from hot. let's say you have 20 gallons of gas at room temperature. Due to the coefficient of expansion, if you cool that to 30 degrees, it will contract to 19 gallons, and you can get one more gallon into your 20-gallon tank, which will increase the distance you can drive on a tankful by 5%. So 19 gallons of cold gas will take you as far as 20 gallons of hot gas. Because it has exactly the same amount of potential energy, but takes up less space, and we calculate mileage by the volume of the gas, which varies by temperature. (I have no idea what the actual coefficient of expansion is, but it is significant enough to expand quite a bit out onto the ground if you fill up to the brim with cold gas on a hot day.)
I just checked on that, and found this interesting observation: http://www.consumerwatchdog.org/reso...lUSAJune07.pdf
Wholesale gasoline prices are adjusted to 60 degrees, so during the summer, motorists will pay $1.5 billion too much for expanded gas.
Gasoline expands about 4.5 times as much as water does.
This is true, but the gasoline temperature is going to be about the same as ground temperature unless you buy gas right after a truck fills the storage tanks and it's quite cold outside. This might explain Cat's situation for one tank full's worth of anomalous improved MPG.
It is hard to get a grasp of your improvements since you are not posting precise numbers/calculations. However glad to see your saving some $$$ on fuel costs.
new air filter = better mpg. Also, maybe the dealership put the correct psi in the tires. Also = better mpg.
This is very true. I get 19.6 MPG on my car that is supposed to average 17. I have found that I gain 1 MPG per every .25 PSI over the recommended pressure for the car's tires. Using thinner engine oil also helps, as does changing the air filter every 6000 miles.
It is hard to get a grasp of your improvements since you are not posting precise numbers/calculations. However glad to see your saving some $$$ on fuel costs.
Well, since the cost of gasoline is beginning to rise pretty rapidly, he may not be saving any money.
Well, since the cost of gasoline is beginning to rise pretty rapidly, he may not be saving any money.
I have been on a diesel-only diet for the past 5 months or so, getting ready to roll out the gassers. However I have not noticed any consistently risen prices, they have all hovered around the same values for quite some time.
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