SheffieldSteel

You will need:- An RX8 with a working trip counter A pen or pencil A gas station which has automatic shutoff pumps and which prints out receipts Here's how it works:- Fill the tank until the automatic latch shuts off the gas flow. Get the receipt. Write the number from the trip counter on the receipt. Zero the trip. That's all you need to do. After a while, you will have a collection of receipts. The first one is useless, but all the rest are good. Each receipt should have the date, the number of gallons of gas bought, and the number of miles that your car travelled on that much gas. Miles per gallon = number of miles / number of gallons.

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cyclone1208

heyarnold69

I stopped doing this ... it made my heart hurt

Mr.ThunderMakeR

This is what I do. My question though is how consistent are the auto-shutoff's at the fuel tank? Is how much gas you put in really how much gas you burned? I guess this is only a factor if you are calculating mpg for one tank of gas. If you average several tanks of gas this factor will be mitigated.

RIWWP

Make sure you divide the result by the number of idiots within 10 miles or by the number of cylinders your neighbor thinks you have. Whichever is higher.


Keep the real number to yourself, no one believes it is that high anyway.

SheffieldSteel

This might seem obvious to some, but I've seen a lot of posts from people who're trying to do estimates based on things like the position of the fuel gauge, and I just wanted to show how easy it is to do it right.

@Mr.ThunderMakeR: Yes, the operation of the latch mechanism might introduce a certain error (does anyone know how big it might be?) As you say, doing an average (total miles / total gallons) for several fill-ups will tend to remove that error.

CyberPitz

You need to multiply the ending number in how many people did a head turn when you drove by on the way to the gas station.

:D

Huey52

LOL Me too. I just drive mine hard and try not to notice the rapidly falling gas gauge.

NautyOne

http://www.fuelly.com/

mbentley

i just keep a small notebook in my glovebox. i just write down the date, mileage, gallons, cost and figure the mpg. i also write all of my maintenance in the same notebook. easy to keep track of that way.

Vyndictive

Applied Algebra is, indeed, very hard. Our public schools are failing us for sure. . . isn't there an app for the iphone that can just tell me so I don't know to know numbers?

Are-Ex-Eight

Is this thread serious?

Gitfiddle

I just realize and accept that i spend $160 a month for gas

Spin9k

FYI ... this isn't algebra, applied or otherwise ... simple division is what's required here, and sadly even that's a skill not all have attained. Even with an iphone app you'll need to "know" the numbers...I think...whatever that means. BTW, it's the students, not the schools that are failing ...in math ...and apparently in English as well.

Grungepup

........ your killing me smalls

Are-Ex-Eight

No way MPG means miles divided by gallons. That's way to easy.

Twiztog43

my question is when do i fill up? because how would you know how much [exactly] gasoline you have left in the tank

laythor

somewhere, every teacher who ever tried to teach you math are weeping in unison.

Twiztog43

thanks for that.

CyberPitz

Your MPG doesn't care about how much is left. Just how much you used *by how much you filled up to full* and how many miles you've driven...

robrecht

I was going to say people who don't know how to calculate their mileage aren't likely to read this thread anyway, but then ...

Pico

Wow............ This thread has got me scared---- Unbelievable

Are-Ex-Eight

Think...these people have licenses. ..

pdxhak

simple math FTW??

MICHGoBlue

Weird.

Usually I just fill up one gallon at a time, see how long I can go before I have to call AAA to give me enough gas to the nearest gas station, fill up another gallon, run out again and so on and so forth.