Gas Millage

joeyz10 · 04-03-2009, 11:52 PM

Hey guys we are driving a sports car! Why worry about milage? We're supposed to see how this car can push so let's keep pushing it...If you want good milage then get a prius or yaris or civic

armensti · 04-04-2009, 02:52 AM

ok so i just came back from a 1:30 drive and i came to a conclusion that the computer system is BS lol im just joking.

I took the car out on the freeway and i left it in 6th gear with cruise control on at 70 mph. i reset the computer by holding down the first button and i kept on driving. when the computer was done calculating i was getting about 36.6mpg and 69.5 mph. after few minutes it slowly started to go down to 33 and then to 30 and then to 29 and so on and on. after some time i started averaging about 24.5mpg and then 25 and then 26, 27, 28. so the highest that i had was 36.6 and the lowest that i had was about 24.5 on the freeway. It mostly depends on the road, if its bumpy and an incline the gas mileage gets less but if its smooth and a decline the gas mileage increases.

After an hour of driving on the freeway i decided to get off and drive on the street to see what happens. i got off the freeway and i started driving on the street. i wanted to reset the computer again so it starts off its calculation on the street. so i did it and when it came back on i was getting 33.6 mpg for like 5-10 minutes but then it went down to 28, 27, 25. the lowest i had on the street was about 22.3 but the average is anywhere from 24.5 to 25.2. i dont know if it will change tomorrow but after driving it for 30 minutes and going threw a good amount of red lights my average was 25mpg.

On the street when taking off on first i wouldn't let the rpm go higher then 1.5k. after 1st i would go to 2nd, after about 15-20 feet of driving on first. Right before i hit 15-20mph i would go to 3rd and go all the way to 25-30mph and i would skip 4th and go straight to 5th. and i was driving like that for most of the time. if i was approaching a red light i would go to neutral from 5th from far away and wait until it turned green and i would drop it to 4th and then 5th. I even tried 6th for few minutes but it didn't make any difference so i don't think we need to use 6th on the street.

so before i did this i was getting about 15.9 mpg now it says im getting 25mpg so give it a try and lets see what happens.

p.s. i probably would not be driving like this again because its so slow people might mistake me for a granny lol

chubbs · 04-04-2009, 03:09 AM

What you've just described is all absolutely normal behaviour for the device. The average mpg for these cars will be about 19mpg, so if yours has been slightly lower than that (ie 15.9) it suggests that you're either doing a higher proportion of 'town' driving or using quite high revs - or a bit of both.

15.9, although it's a little on the high side, is still within reasonable limits. If you take it on a track you'll get significantly less, for example.

XenChi · 04-04-2009, 09:58 AM

Quote:

Originally Posted by arcticreaver

i drive like a normal person. but i have a 7AT. right now, it's telling me i have 23.0.

How many miles do you have on the clock? I have a 7AT Base w/SP and I drive CAREFULLY but can only seem to get 14.9MPG. (400 miles on the clock thus far.)

ChrisSlicks · 04-05-2009, 08:46 AM

Gas mileage at the auto-x was 3.5.

It burns fuel fast once you put your foot down.

Forumite · 04-05-2009, 06:23 PM

The 4 days I drove to work I went from 15 - 24MPG in mine, all highway. Now that I havea beater and dont drive it to work the MPG has dipped down to 22.5.

alan93rsa · 04-06-2009, 05:26 PM

From Cincinnati to Columbus and back I averaged 27 on the highway. Cruise set at 70.

wstar · 04-06-2009, 05:57 PM

I wish they had made 6th and especially 7th on the 7AT a bit "taller". Where they're geared right now, fuel economy drops off too sharply at 80+ mph due to the high revs. A little more gearing and you could save a lot of fuel on highway cruises in the fast lane. Next drive I'll actually remember some specific RPM values in 7th at various speeds, it would be interesting to compare them to where the 6MT guys are sitting at in 6th.

minik2 · 04-06-2009, 07:14 PM

Has anybody done actual calculation using the mileage driven divided by how many gallons you fill up....this would be the most accurate way even though you may top it off differently a little everytime....an average of a couple fill ups should be a good indicator....i dont have this car but i was riding backseat in someones VW and was watching the mpg gauge the whole time and it had a range of 15-50 mpg and i was like WTF definitely dont trust the computer to get actual numbers...it may be a good ball park figure over a large average though?

alan93rsa · 04-06-2009, 07:29 PM

That is how I calculated the 27 mpg above. Filled up and triple clicked the pump to start and did the same at the end of the trip at the same station. It could be off a bit but it should be close.

From Cincinnati to Columbus on I71 the terrain is pretty flat with some rolling hills.

WooZ · 04-06-2009, 09:31 PM

Quote:

Originally Posted by minik2

Has anybody done actual calculation using the mileage driven divided by how many gallons you fill up....this would be the most accurate way even though you may top it off differently a little everytime....an average of a couple fill ups should be a good indicator....i dont have this car but i was riding backseat in someones VW and was watching the mpg gauge the whole time and it had a range of 15-50 mpg and i was like WTF definitely dont trust the computer to get actual numbers...it may be a good ball park figure over a large average though?

k.alexander · 04-07-2009, 01:13 PM

^ I've done the math (miles driven divided by gallons put in and used) a few times, on very very mixed driving, I'm getting about 21.5-22 mpg.

04-04-2009, 03:09 AM	#18 (permalink)
chubbs A True Z Fanatic Join Date: Jan 2009 Location: Zeeland Posts: 1,046 Drives: 2016 370z Auto-Grey Rep Power: 7586	What you've just described is all absolutely normal behaviour for the device. The average mpg for these cars will be about 19mpg, so if yours has been slightly lower than that (ie 15.9) it suggests that you're either doing a higher proportion of 'town' driving or using quite high revs - or a bit of both. 15.9, although it's a little on the high side, is still within reasonable limits. If you take it on a track you'll get significantly less, for example. __________________ . '03 Grey >>> '06 Black >>>'10 Silver >>> '16 Grey ^

04-06-2009, 05:26 PM	#22 (permalink)
alan93rsa Enthusiast Member Join Date: Feb 2009 Location: Ohio Posts: 412 Drives: 16 Cayman GT4 Red Rep Power: 220	From Cincinnati to Columbus and back I averaged 27 on the highway. Cruise set at 70. __________________ 16 Cayman GT4, Carmine Red, Buckets, PCCB etc.

04-06-2009, 05:57 PM	#23 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	I wish they had made 6th and especially 7th on the 7AT a bit "taller". Where they're geared right now, fuel economy drops off too sharply at 80+ mph due to the high revs. A little more gearing and you could save a lot of fuel on highway cruises in the fast lane. Next drive I'll actually remember some specific RPM values in 7th at various speeds, it would be interesting to compare them to where the 6MT guys are sitting at in 6th. __________________ 7AT Track Car! Journal thread / Car setup details

04-06-2009, 07:29 PM	#25 (permalink)
alan93rsa Enthusiast Member Join Date: Feb 2009 Location: Ohio Posts: 412 Drives: 16 Cayman GT4 Red Rep Power: 220	That is how I calculated the 27 mpg above. Filled up and triple clicked the pump to start and did the same at the end of the trip at the same station. It could be off a bit but it should be close. From Cincinnati to Columbus on I71 the terrain is pretty flat with some rolling hills. __________________ 16 Cayman GT4, Carmine Red, Buckets, PCCB etc.

04-07-2009, 01:13 PM	#27 (permalink)
k.alexander Base Member Join Date: Feb 2009 Location: Philadelphia, PA Age: 45 Posts: 240 Drives: 09 Nissan 370Z PG M6 Rep Power: 714	^ I've done the math (miles driven divided by gallons put in and used) a few times, on very very mixed driving, I'm getting about 21.5-22 mpg. __________________ -Are you coming to bed? -I can't. This is important. -What? -Someone is WRONG on the internet.

04-03-2009, 11:52 PM	#16 (permalink)
joeyz10 Base Member Join Date: Mar 2009 Location: SoCal Posts: 248 Drives: 09 370z AT/ RRSS 08/ Rep Power: 16	Hey guys we are driving a sports car! Why worry about milage? We're supposed to see how this car can push so let's keep pushing it...If you want good milage then get a prius or yaris or civic

04-04-2009, 02:52 AM	#17 (permalink)
armensti Enthusiast Member Join Date: Mar 2009 Location: CA Posts: 447 Drives: 370Z/Tring/Spt/6MT Rep Power: 16	ok so i just came back from a 1:30 drive and i came to a conclusion that the computer system is BS lol im just joking. I took the car out on the freeway and i left it in 6th gear with cruise control on at 70 mph. i reset the computer by holding down the first button and i kept on driving. when the computer was done calculating i was getting about 36.6mpg and 69.5 mph. after few minutes it slowly started to go down to 33 and then to 30 and then to 29 and so on and on. after some time i started averaging about 24.5mpg and then 25 and then 26, 27, 28. so the highest that i had was 36.6 and the lowest that i had was about 24.5 on the freeway. It mostly depends on the road, if its bumpy and an incline the gas mileage gets less but if its smooth and a decline the gas mileage increases. After an hour of driving on the freeway i decided to get off and drive on the street to see what happens. i got off the freeway and i started driving on the street. i wanted to reset the computer again so it starts off its calculation on the street. so i did it and when it came back on i was getting 33.6 mpg for like 5-10 minutes but then it went down to 28, 27, 25. the lowest i had on the street was about 22.3 but the average is anywhere from 24.5 to 25.2. i dont know if it will change tomorrow but after driving it for 30 minutes and going threw a good amount of red lights my average was 25mpg. On the street when taking off on first i wouldn't let the rpm go higher then 1.5k. after 1st i would go to 2nd, after about 15-20 feet of driving on first. Right before i hit 15-20mph i would go to 3rd and go all the way to 25-30mph and i would skip 4th and go straight to 5th. and i was driving like that for most of the time. if i was approaching a red light i would go to neutral from 5th from far away and wait until it turned green and i would drop it to 4th and then 5th. I even tried 6th for few minutes but it didn't make any difference so i don't think we need to use 6th on the street. so before i did this i was getting about 15.9 mpg now it says im getting 25mpg so give it a try and lets see what happens. p.s. i probably would not be driving like this again because its so slow people might mistake me for a granny lol

04-05-2009, 08:46 AM	#20 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	Gas mileage at the auto-x was 3.5. It burns fuel fast once you put your foot down.

04-05-2009, 06:23 PM	#21 (permalink)
Forumite Base Member Join Date: Mar 2009 Location: Virginia Posts: 142 Drives: 09 370Z Rep Power: 16	The 4 days I drove to work I went from 15 - 24MPG in mine, all highway. Now that I havea beater and dont drive it to work the MPG has dipped down to 22.5.

04-06-2009, 07:14 PM	#24 (permalink)
minik2 Base Member Join Date: Apr 2009 Location: NJ Posts: 3 Drives: mustang Rep Power: 16	Has anybody done actual calculation using the mileage driven divided by how many gallons you fill up....this would be the most accurate way even though you may top it off differently a little everytime....an average of a couple fill ups should be a good indicator....i dont have this car but i was riding backseat in someones VW and was watching the mpg gauge the whole time and it had a range of 15-50 mpg and i was like WTF definitely dont trust the computer to get actual numbers...it may be a good ball park figure over a large average though?