Would think with the precise metering the computer has to do for direct injection it is very accurate but has anyone verified the old way.

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Would think with the precise metering the computer has to do for direct injection it is very accurate but has anyone verified the old way.

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But, I only have 850 miles on my car so far, and that was the second fill up since buying the car. I imagine it may be closer as the engine breaks in.

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Computer says:

27 mpg

27.9 mpg

34 mpg

Math says:

26.8 mpg

25.6 mpg

31.7 mpg

It is off, but not alot. I need to fill up on friday and will update the results.

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Scotty B

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You are right, you dont really know that you are leaving the gas station with the EXACT amount of gas, its just an estimate. For the most accuracy, Ive always found that its best to go to the same gas station and try to get the same pump each time you do it and make sure you follow the same filling technique. LIke, if you stop after the first click, or do you go to a second or third click? Ive always liked going to 3 clicks when I fill up and I do that everywhere I go.

Scotty B

And I think your calculation is off. There are 16 cups in a gallon (8oz vs 128 oz). So lets say you went 250 miles and used 10 gallons of gas, that would be 25 MPG. If you went 250 miles and used 10.0625 gallons, that would be 24.84, a difference of 0.16 MPG. The difference is negligible.

I see what you are saying, but wouldn't you go by the numbers on the pump? If it says you put in 17.5 gallons, you have most likely put in 17.5 gallons. Wouldn't you just divide the number of miles driven by the number of gallons you put in the car? The amount of fuel in the tank should not matter. Just a newbie opinion... :whistling:You are right, you dont really know that you are leaving the gas station with the EXACT amount of gas, its just an estimate. For the most accuracy, Ive always found that its best to go to the same gas station and try to get the same pump each time you do it and make sure you follow the same filling technique. LIke, if you stop after the first click, or do you go to a second or third click? Ive always liked going to 3 clicks when I fill up and I do that everywhere I go.

And I think your calculation is off. There are 16 cups in a gallon (8oz vs 128 oz). So lets say you went 250 miles and used 10 gallons of gas, that would be 25 MPG. If you went 250 miles and used 10.0625 gallons, that would be 24.84, a difference of 0.16 MPG. The difference is negligible.

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I use the same pump at my favorite local gas station the majority of the time and set the flow on its slowest setting after seating the nozzle properly. I let the pump click off on its own and when that happens, I'm done. I use a credit card and am unconcerned whether the purchase ends at a round dollar amount or not.

Scotty B

I suppose I might get a tablespoon more or less here and there by letting the pump click off on its own, but I just can't put the act of getting gas under such scrutiny. I feel very confident I am getting consistent results.

(edited to add last sentence)

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You have it correct. You go off what the pump says when you fill it up and just divide the total miles traveled on your trip odometer by how much gas you put in.I see what you are saying, but wouldn't you go by the numbers on the pump? If it says you put in 17.5 gallons, you have most likely put in 17.5 gallons. Wouldn't you just divide the number of miles driven by the number of gallons you put in the car? The amount of fuel in the tank should not matter. Just a newbie opinion... :whistling:

You dont always need to wait til your tank is completely empty. What I do is just pick a gas station I like by my house, and when I get somewhere under half a tank, I top it back off. That way I can be sure I go to the same station as often as possible and can get consistent results.

I guess the math you are applying here is different that the regular one. If you fill the tank to 18 gallons or 18 gallon plus a cup does not make much of a difference at all. Anywas my computer shows 1 mile more per gallon than the math, so it is close enough. I have 3300 miles and I am giving up on calculating these numbers because the Sonata is an excellent car and it depends on me how many gallons per mile it gets because I am pushing the pedal.

Scotty B

either way, i've found out that it's pretty close, not enough to completely worry about.

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Considering there are 16 cups per gallon, I don't think 1 cup is going to make 1.875 mpg difference on a fillup. More like .1 mpg in a 14 gallon fillup. Even if it was off a quart, it only changes by .52 mpg, if my (potentially flawed) math is correct.

Scotty B

In the end all I know is that this car is getting about 10-15mpg MORE than the last car I was driving..... Which is nice!!

Scotty B

I love the Sontata and this doesn't deter from that. Very pleased with the gas mileage to date.

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Actually, it's best to fill up first thing in the morning. That's when the fuel is at it's coldest, and therefore most dense. As a result you get more fuel by volume. As for efficiency, again, colder is better. The air is more dense and therefore more oxygen by volume. More oxygen = hotter burning = more power and better efficiency.

either way, i've found out that it's pretty close, not enough to completely worry about.

Reference: What is the best time of day to buy gas?

As for calculating milage, it doesn't matter how much you add, however the more gas you use and the further you drive, the more accurate your calculation will be. All you do is divide the miles driven by the gallons added. It's that simple. Just be sure to reset the trip meter every time you fill up.

Reference, take your pick: How to calculate MPG

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