crusing speed rpm?

Grey2.0SI · 06-09-2008, 10:16 PM

so im driving down the highway and i notice im crusing at 70 mph but im hovering around 3000 rpm. Is that normal?

if it is, then does that mean if we get the urge to go 80 down an empty highway our mpg goes to hell because we're at 4000 rpm constant?

kbeeveer46 · 06-09-2008, 10:42 PM

It's a little over 3k for me, too. I was in a 2001 Accord the other weekend and it was a little over 2k on the highway.

07 fg2 · 06-09-2008, 10:45 PM

at 70mph i'm a tick over 3k.

Mitch · 06-09-2008, 10:48 PM

Quote:

Originally Posted by 07 fg2

at 70mph i'm a tick over 3k.

Same here. There are sections of road on my semi-monthly 270 mile round trip commute where the speed limit is a constant 60 or 55 mph for extended stretches. I get phenominal fuel economy on those stretches. 3000rpm is just a little too high to spin the engine for optimal fuel economy.

Grey2.0SI · 06-09-2008, 10:49 PM

y is it a grand higher on our cars? lack of torque?

Mitch · 06-09-2008, 10:50 PM

Quote:

Originally Posted by Grey2.0SI

y is it a grand higher on our cars? lack of torque?

Gear ratios. If 6th was geared low enough to cruise at 2250, there would be too dramatic of an rpm drop shifting from 5th to 6th.

taffysi · 06-09-2008, 10:57 PM

Highway miles going around 65-70 average or so, I managed to get 34 mpg, but this is only constant highway miles tested on my last road trip.

SoCal07Si · 06-09-2008, 11:02 PM

I'm at 3k at 65

Adren77 · 06-09-2008, 11:47 PM

On my car it is exactly 3k rpm at 67-68 mph.

duerrs · 06-10-2008, 03:28 PM

Quote:

Originally Posted by Adren77

On my car it is exactly 3k rpm at 67-68 mph.

thats exactly where i am too

B-Stylz · 06-10-2008, 03:42 PM

Quote:

Originally Posted by Grey2.0SI

so im driving down the highway and i notice im crusing at 70 mph but im hovering around 3000 rpm. Is that normal?

if it is, then does that mean if we get the urge to go 80 down an empty highway our mpg goes to hell because we're at 4000 rpm constant?

But you didn't say in what gear?

volvo9 · 06-10-2008, 03:51 PM

Small engines need to rev higher on the highway because they lack the torque needed to run slower, also the Si revs higher than the R18 because it was designed for higher performance, so the gear ratios are shorter and closer togeather.

With bigger engines you can have taller gears, I had a 3.8 Sable that would turn about 2200 rpm's at 65 - 70.

Duce2k · 06-10-2008, 07:06 PM

Quote:

Originally Posted by Adren77

On my car it is exactly 3k rpm at 67-68 mph.

Yeah that's where I'm at too

***Whocares05050*** · 06-10-2008, 07:16 PM

I usually cruise around 85-90 highway. about 4200 -4500 if im not mistakin. still get around 320 on the highway tank.

***08usmcSI*** · 06-10-2008, 07:27 PM

Quote:

I usually cruise around 85-90 highway. about 4200 -4500 if im not mistakin. still get around 320 on the highway tank.

thats impressive to cruise on 4500 rpms and get 320 still

Psycwon · 06-11-2008, 08:47 AM

You think the Si is bad, I used to have a 6 speed Wrangler.. Talk about crazy gear ratios.. I could start in 4th with no problem..

Anyway being close to i95 where cruising speed is generally 70+ your MPG does go to hell.. I just can't stand ALL those cars passing me when I'm in the slow lane..

natedog_37 · 06-11-2008, 09:35 AM

I crusie around 75, 80 ish do about 90% highway and get around 30, 32 MPG.

chaohliu · 06-11-2008, 09:41 AM

Quote:

Originally Posted by natedog_37

I crusie around 75, 80 ish do about 90% highway and get around 30, 32 MPG.

That's pretty impressive! Glad to know that the SI doesnt need to be at 55mph to get 30+ mpg. With gas prices so high, getting 30+ mpg is a priority.

Psycwon · 06-11-2008, 10:17 AM

Quote:

Originally Posted by chaohliu

That's pretty impressive! Glad to know that the SI doesnt need to be at 55mph to get 30+ mpg. With gas prices so high, getting 30+ mpg is a priority.

I wish I got 30 mpg. My 07 ex coupe got 30-32 but the civic usually gets around 23.. I did get 27 once. I do a lot of stop and go though, that's what kills me.

NOVAblackSiSedan · 06-18-2008, 11:26 AM

When cruising at 80mph I'm turning 3500rpm. Recent trip from NJ back to Nova cruising at 80 basically the whole way returned about 30mpg.

06-09-2008, 10:16 PM	#1 (permalink)
Grey2.0SI Senior Member Join Date: May 2008 Location: North Side Texas Posts: 605 Michael iTrader: 1 / 100%	crusing speed rpm? so im driving down the highway and i notice im crusing at 70 mph but im hovering around 3000 rpm. Is that normal? if it is, then does that mean if we get the urge to go 80 down an empty highway our mpg goes to hell because we're at 4000 rpm constant?

06-10-2008, 03:51 PM	#12 (permalink)
volvo9 Senior Member Join Date: Oct 2006 Location: North Attleboro, MA Age: 25 Posts: 2,081 Andrew iTrader: 0 / 0%	Small engines need to rev higher on the highway because they lack the torque needed to run slower, also the Si revs higher than the R18 because it was designed for higher performance, so the gear ratios are shorter and closer togeather. With bigger engines you can have taller gears, I had a 3.8 Sable that would turn about 2200 rpm's at 65 - 70. Last edited by volvo9; 06-10-2008 at 03:53 PM.

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06-09-2008, 10:42 PM	#2 (permalink)
kbeeveer46 Senior Member Join Date: Apr 2008 Location: Muncie, IN Age: 23 Posts: 275 Kyle iTrader: 0 / 0%	It's a little over 3k for me, too. I was in a 2001 Accord the other weekend and it was a little over 2k on the highway.

06-09-2008, 10:45 PM	#3 (permalink)
07 fg2 Senior Member Join Date: Oct 2007 Location: Houston,TX Posts: 413 iTrader: 1 / 100%	at 70mph i'm a tick over 3k.

06-09-2008, 10:49 PM	#5 (permalink)
Grey2.0SI Senior Member Join Date: May 2008 Location: North Side Texas Posts: 605 Michael iTrader: 1 / 100%	y is it a grand higher on our cars? lack of torque?

06-09-2008, 10:57 PM	#7 (permalink)
taffysi Senior Member Join Date: Oct 2006 Posts: 634 iTrader: 0 / 0%	Highway miles going around 65-70 average or so, I managed to get 34 mpg, but this is only constant highway miles tested on my last road trip.

06-09-2008, 11:02 PM	#8 (permalink)
SoCal07Si Senior Member Join Date: Jan 2008 Location: Whitter, So Cali Age: 21 Posts: 12,145 Just call me Daddy iTrader: 1 / 100%	I'm at 3k at 65

06-09-2008, 11:47 PM	#9 (permalink)
Adren77 Junior Member Join Date: Jun 2008 Posts: 12 iTrader: 0 / 0%	On my car it is exactly 3k rpm at 67-68 mph.

06-11-2008, 08:47 AM	#16 (permalink)
Psycwon Junior Member Join Date: Oct 2007 Location: Baltimore, Murderland Posts: 15 iTrader: 0 / 0%	You think the Si is bad, I used to have a 6 speed Wrangler.. Talk about crazy gear ratios.. I could start in 4th with no problem.. Anyway being close to i95 where cruising speed is generally 70+ your MPG does go to hell.. I just can't stand ALL those cars passing me when I'm in the slow lane..

06-11-2008, 09:35 AM	#17 (permalink)
natedog_37 Senior Member Join Date: Apr 2008 Location: Temperance, MI Age: 30 Posts: 142 iTrader: 0 / 0%	I crusie around 75, 80 ish do about 90% highway and get around 30, 32 MPG.

06-18-2008, 11:26 AM	#20 (permalink)
NOVAblackSiSedan Member Join Date: Aug 2007 Location: No. VA Posts: 56 iTrader: 0 / 0%	When cruising at 80mph I'm turning 3500rpm. Recent trip from NJ back to Nova cruising at 80 basically the whole way returned about 30mpg.