Better mileage going 65 than 60? - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 11-25-2008, 08:35 PM   #1
Registered Member
 
Join Date: Sep 2005
Posts: 29
Country: United States
Better mileage going 65 than 60?

This is in a '93 Civic 2dr DX 5spd, all stock...

I've noticed the past few tanks that I'm getting better mileage going 65-70 than I do going 60mph. I've been speeding lately because I seem to always be running late to school or work.

Additionally, as I look over my gas log, most of my tanks where my mileage is on the higher end of the spectrum, I note that I wasn't driving efficiently, I was speeding everywhere and/or generally driving like a maniac, sitting in traffic, go through drive-throughs. Yet when I baby the car, drive no faster than 60mph, don't sit through any drive-throughs, my mileage doesn't seem to increase.

I guess this is exactly why a SuperMID is vital to have. I will definitely have to try to get one at some point.

Has anybody else noticed anything quirky like this? Until my mileage shows otherwise, I'm going to start speeding!
__________________

Jonathan_ED3 is offline   Reply With Quote
Old 11-26-2008, 01:59 AM   #2
Registered Member
 
Join Date: Oct 2007
Posts: 298
Country: United States
You just have to love the way that people tend to take a 'one size fits all' approach to improving fuel economy. But the truth is that this almost never works. Every car is a little different. Drag coefficint is NOT a constant, and can actually DECREASE with increasing speed over some range(s) of speed. And it is also quite possible that your engine (like SO many Honda engines) is just not very happy cruising at low RPMs. So you just have to experiment to see what gives you the best mileage. Because you can't take it for granted that it will ALWAYS be in the 55-60MPH range.
__________________

StorminMatt is offline   Reply With Quote
Old 11-26-2008, 03:22 AM   #3
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Enjoy it. Drive faster than other GasSavers.org members.

How many RPM is 70mph for you?

Can any other ~1993 DX drivers chime in with their own results?
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 11-26-2008, 07:43 AM   #4
Registered Member
 
aalb1's Avatar
 
Join Date: Apr 2007
Posts: 207
Country: United States
In for this. My last tank was my best tank yet pulse and gliding 50-60mph. On this tank I had the opportunity to P&G 45-60 on the first quarter tank and it seems to have gotten worse. Slower is not always better.

I wish I can have some sort of fuel instrumentation too but it's not happening on my car any time soon.
__________________
aalb1 is offline   Reply With Quote
Old 11-26-2008, 07:46 AM   #5
Registered Member
 
palemelanesian's Avatar
 
Join Date: Apr 2013
Posts: 364
Country: United States
Sort of the same car. Mine is a 96, so it's got the 1.6L engine instead of 1.5.

Some examples, on the same 150 mile route:
P&G 60-70: 55 mpg
P&G 50-65: 63 mpg
P&G 45-60: 67 mpg

This is with heavy use of pulse-and-glide. In some cases, on hills for example, a lower limit of 45 is too low for p&g, and 50 will be better. However, the upper limit can't get too high or mileage will start dropping off. Above 60 is too high for the best mileage.
palemelanesian is offline   Reply With Quote
Old 11-26-2008, 08:08 AM   #6
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Quote:
Originally Posted by aalb1 View Post
I wish I can have some sort of fuel instrumentation too but it's not happening on my car any time soon.
There are options, but none of them are as easy or as nice as the ScanGauge. Check out the DIY fuel rate meter link in my sig.
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 11-26-2008, 08:15 AM   #7
Registered Member
 
palemelanesian's Avatar
 
Join Date: Apr 2013
Posts: 364
Country: United States
One more thing:

For a test, one time, I did a straight, nearly flat segment at 15-30 mph p&g, driving like I was in a competition. 85 mpg.
palemelanesian is offline   Reply With Quote
Old 11-26-2008, 08:23 AM   #8
Registered Member
 
aalb1's Avatar
 
Join Date: Apr 2007
Posts: 207
Country: United States
Quote:
Originally Posted by theholycow View Post
There are options, but none of them are as easy or as nice as the ScanGauge. Check out the DIY fuel rate meter link in my sig.

^^ Yup I got that. It was helpful but still very limited. I have Honda's DPFI system it uses 2 different sized injectors and it's confusing as hell and seems completely random.
I was able to confirm that at steady throttle I get the same FE at 50mph and 55mph. 60mph and it starts to go downhill.
__________________
aalb1 is offline   Reply With Quote
Old 11-26-2008, 08:35 AM   #9
Registered Member
 
palemelanesian's Avatar
 
Join Date: Apr 2013
Posts: 364
Country: United States
Check out the MPGuino project at ecomodder. It might work for you.
palemelanesian is offline   Reply With Quote
Old 11-26-2008, 09:26 AM   #10
Registered Member
 
1993CivicVX's Avatar
 
Join Date: Aug 2007
Posts: 1,066
Country: United States
Send a message via AIM to 1993CivicVX
I drove a '94 Civic DX Coupe to 52.5mpg over a 500+miles tank. I was babying it. I did go 70mph briefly on the highway, but i think I was mostly doing 65 on the highway. I didn't know about P&G at the time, although I did some toward the end of the tank. I've had a few instances where my mileage didn't increase when I babied it more.... There does seem to be an ideal acceleration rate and cruise rate for each vehicle. But what you are describing doesn't really make sense. Describe what you mean by driving like a maniac. And describe what babying it means for you. If you are accelerating too slowly and never getting up to speed then that isn't good either. What RPMs do you shift at when babying it? What RPM do you shift at when driving like a maniac? Idling really doesn't use that much gas.. so it's more how you are accelerating and how much you are breaking that has more impact on mileage than whether you idled through a few drive thrus during the course of the tank.
__________________

__________________
three stripes the charm!

Car mods are overrated. Just gotta adjust that nut behind the wheel for best mpg.



Forget about World Peace...Visualize using your turn signal.
1993CivicVX is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Recent Fuel-ups Graph Scale rcsheets Fuelly Web Support and Community News 5 09-08-2008 04:11 AM
suggestion for stat comparison zahampton Fuelly Web Support and Community News 1 09-04-2008 08:29 AM
Current TV spot merckrx General Fuel Topics 1 08-14-2008 07:36 AM
Amazed by the SGII GeekGuyAndy General Discussion (Off-Topic) 7 08-19-2007 12:25 AM
Greetings from Japan. GasSavers_Diemaster General Discussion (Off-Topic) 8 07-13-2006 07:56 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 02:56 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.