I used the search function and found tons of threads regarding gas mileage and it seems everyone's calculating theirs a different way. Even the calculations given by the car seem inaccurate (for those of you with Navs)...

If you never set it up from your last fill up, you cannot calculate your gas mileage until the next time...and this is how you do it:

1. The next time you fill up, reset one of your trip meters. (example: Trip A).

2. When you have to fill up again, go and fill it up all the way, and then look at the gas pump to see how many gallons you'd just put in your car. (Example: gas pump says you filled up 18.53 gallons).

3. Now, go back into your car, look at your trip meter to see how many miles you got on it. (example: Trip A: 294 miles).

4. Take the number trip meter, and divide it by the total number of gallons you filled up, and TADA, your MPG. (example: 294/18.53=15.86616mpg)



I went from a 2004 350Z 6M/T manual to a 2005 G35c 5A/T, and my Z was getting an average of 18-19mpg, but I'm getting like 15.8mpg in the G35c.

So, what are you getting based on this calculation? Don't look at your computer, but calculate it yourself.

 

I actually did the same method you mentioned above, and it actually matched the mpg that my navigation stated. I was sceptic at first about the accuracy of the navi, but it's actually pretty accurate.

Oh ya... since I drive mostly freeways to work, my mpg is usually around 18-19 on my g35c. Are you doing alot of driving on the streets?

 

1. The next time you fill up, reset one of your trip meters. (example: Trip A).

2. When you have to fill up again, go and fill it up all the way, and then look at the gas pump to see how many gallons you'd just put in your car. (Example: gas pump says you filled up 18.53 gallons).

3. Now, go back into your car, look at your trip meter to see how many miles you got on it. (example: Trip A: 294 miles).

4. Take the number trip meter, and divide it by the total number of gallons you filled up, and TADA, your MPG. (example: 294/18.53=15.86616mpg)


Without navi how else would you calculate MPG?

 

I use this method everytime I get gas, and have been for almost a year now, my average before the supercharger is about 18mpg
will tell you what it is now after a couple of gas tank fulls

 

This is what i use too, and i calculate it on the gas receipt, and keep ALL of the receipts in a old ipod sleeve haha. i can't imagine counting it all up...49.50 here, 55.00 there.. about 17mpg i would say, mostly city driving.

 

I thought that method was an understood, thats the only way to calculate gas mileage accurately. I hope thats the way most people do it .

 

well...I drive to work everyday, which is about 5 minutes from my house...but I do like to go driving for fun, and I do get on the freeway a lot just to joyride...heck, I live in Houston, we gotta drive everywhere we go...I was just trying to compare it to when I had the Z, and the Z was giving me better gas mileage in the same daily driving condition.

 

I've never calculated any other way... didn�t realize there was a misconception on how to determine MPG... I never see better than 20mpg - unless it's a rare 200+ mile trip (and even then maybe only 21.XX)... with mostly city driving I get only 17-18. Granted it is with some spirited driving, but mostly easy driving (if I got to the track it's worse)... gas mileage just plain sux on these cars. But I don't care.

 

isn't that common sense... I don't think miles per gallon can mean anything else..

 

Haha! Seriously?! WTF is this?

 

haha.... how else would you calculate mpg? Record the miles and then drive it until you run out of gas?!?

Definately common sense to use the procedure above. :-/

 

You'd be surprised how many people base MPGs off just the gas gauge. I typically see 18-20 in mostly city driving, 27mpg in 100% highway driving, and as high as 29.8mpg on highway trip from Atlanta to St. Augustine, FL.

 

I dont think any 1st graders drive G's. lol just j/k. But yea I get crappy MPG in my 5AT coupe. Last time I calculated MPG I didn't hit 3500rpm even once. But came up to around 16mpg (rounded up).

 

Ouch! Something wrong there... unless the reason you didn�t get to 3500 is it was constant stop and go street/city driving - worst I've had in that scenario was 15.XX... usually 17 though.

 

+1. Im a little shocked we even need a write up on it