Go Back   EcoModder Forum > EcoModding > Hypermiling / EcoDriver's Ed
Register Now
 Register Now

Reply  Post New Thread
Submit Tools LinkBack Thread Tools
Old 02-01-2014, 03:09 AM   #21 (permalink)
Should I turn here...?
Join Date: Jan 2014
Location: Port Angeles, WA
Posts: 53

Silver Civic - '96 Honda Civic CX
Thanks: 1
Thanked 17 Times in 6 Posts
Thanks for piping up, Detail Man! If you have any certain techniques that you do/use, please post.

On the "how long must the engine be off to save fuel vs. idling" question-- have there been any studies/testing done to see how much fuel is used on startup for a given engine? Is there any tech data available? Then it could be compared to the gal/hr used at idle (Scangauge computes this, right?) to see how long it takes to reach the break even point. Are there any other threads on this topic?


Update! I just filled my tank tonight: 338.7 miles and 8.878 gal. 38.15 mpg. This seems to be within a reasonable margin of error compared to last week's 37.2 mpg. I'll be continuing the techniques I'm currently using for another tank or two (and keeping y'all posted), and meanwhile looking in Radio Shack and such places for a good switch to make a kill-switch. I kind of want one anyway for theft prevention, since I tend to leave my keys in the car (both while delivering, and there's usually a spare key inside the car somewhere).

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

Old 02-01-2014, 03:25 AM   #22 (permalink)
Join Date: Oct 2009
Location: South Central AK
Posts: 933

escort - '99 ford escort sport
90 day: 42.38 mpg (US)

scoobaru - '02 Subaru Forester s
90 day: 28.65 mpg (US)
Thanks: 32
Thanked 145 Times in 97 Posts
when I rocked a civic it the break even point was less than 10 seconds. I forget the math but data was gathered with an mpguino that was more accurate than a scan/ultra guage could be.

Learn from the mistakes of others, that way when you mess up you can do so in new and interesting ways.

One mile of road will take you one mile, one mile of runway can take you around the world.
  Reply With Quote
Old 02-01-2014, 09:01 AM   #23 (permalink)
EcoModding Lurker
Join Date: Jan 2014
Location: East TN
Posts: 15

02 Civic - '02 Honda Civic LX
90 day: 40.32 mpg (US)
Thanks: 0
Thanked 2 Times in 1 Post
So far my techniques are pretty typical for the EM crowd: timing redlights, coasting in neutral, picking routes, running in highest gear for the conditions, etc. Half of our delivery area is typical suburban (redlights, 4 lanes, subdivisions) and the other half is rural (narrow, curvy, hilly, country roads). I have plenty of opportunities for coasting with engine on, but not for engine off coasting (at least that I'm comfortable with not having a kill switch).

This tank I'm turning the engine off at each stop to see if that makes a noticeable difference. An Ultragauge (probably, still researching the different brands) is in the near future. The other technique that will really pay off is getting used to starting out in first without over-revving the engine. It's been years since I've had a stick shift.

@ MetroMPG, I read another thread of your eco-driving lessons. You mentioned that during your demo drive you had the highest average speed for the fuel used. That was an interesting observation, and it confirmed my sense that the fastest speed for the lowest rpms is most efficient.

I also liked your comment that the steep part of the improvement curve was the fun side. That's a bit inspirational.

  Reply With Quote
Old 02-01-2014, 01:50 PM   #24 (permalink)
Should I turn here...?
Join Date: Jan 2014
Location: Port Angeles, WA
Posts: 53

Silver Civic - '96 Honda Civic CX
Thanks: 1
Thanked 17 Times in 6 Posts
When I started delivering pizzas, one of the guys told me that I should be glad if I had an automatic, because I would come to hate driving a stick-shift. I'm so glad I have a manual, though. It's way more fun and interesting to drive, especially as I'm trying to up my mpg-- there's just so much more fine control over stuff like shift points and coasting.
  Reply With Quote
Old 02-18-2014, 11:16 PM   #25 (permalink)
Master EcoModder
backpacker3's Avatar
Join Date: Feb 2014
Location: Michigan
Posts: 384

Homer - '02 Pontiac Sunfire SE
Team Pontiac
90 day: 30.05 mpg (US)
Thanks: 13
Thanked 53 Times in 50 Posts
I just saw that modern fuel injected cars use the same amount of fuel sitting for 7 seconds as they do to start up so really anything over 7 seconds would save fuel then
  Reply With Quote
Old 02-19-2014, 01:54 AM   #26 (permalink)
EcoModding Newb
redpoint5's Avatar
Join Date: Aug 2010
Location: Oregon
Posts: 8,400

Acura TSX - '06 Acura TSX
90 day: 29.14 mpg (US)

Lafawnda - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Prius Plug-in - '12 Toyota Prius Plug-in
90 day: 57.64 mpg (US)

Mazda CX-5 - '17 Mazda CX-5 Touring
90 day: 28.5 mpg (US)
Thanks: 2,832
Thanked 3,230 Times in 2,408 Posts
Does that account for the loss of battery charge from starting the vehicle? I'd think the alternator would take add another couple seconds to the equation.
Gas and Electric Vehicle Cost of Ownership Calculator

Give me absolute safety, or give me death!
  Reply With Quote
Old 02-19-2014, 08:12 AM   #27 (permalink)
What brake pedal?
digital rules's Avatar
Join Date: Feb 2014
Location: Chantilly, Virginia
Posts: 210

Silver Streak-5M - '05 Toyota Corolla S
Team Toyota
90 day: 42.41 mpg (US)
Thanks: 107
Thanked 45 Times in 38 Posts
Originally Posted by redpoint5 View Post
Do you have a manual transmission? I get the same MPG regardless of stop and go or steady highway driving because I let a gap develop ahead of me, and I coast while traffic is slowing, and accelerate slightly when it picks up. Basically, I drive the average speed of traffic and don't worry if people cut into that gap. This strategy might not work as well in cities other than Portland due to other drivers being more aggressive. In Portland, people tend to move out of my lane about as often as they move into it, so I barely loose any time by leaving a gap.
This is exactly how I drive & it works wonders, even here in DC. No real difference in city/hwy MPG.

Most of the OP's fuel is likely wasted during acceleration & mastering the manual should make a noticeable difference. In more rural situations when getting up to speed, shift as early as possible & don't be afraid to dive into the accelerator. Just keep those RPM's as low as possible w/o lugging the engine.

Also when in stop & go traffic, tame the wave as much as possible to avoid complete stops. Accelerating from a 1-2 MPH creep is much better than from a complete stop.

  Reply With Quote
Old 02-21-2014, 03:44 PM   #28 (permalink)
Master Novice
elhigh's Avatar
Join Date: Jan 2008
Location: SE USA - East Tennessee
Posts: 2,296

Josie - '87 Toyota Pickup
90 day: 33.51 mpg (US)

Felicia - '09 Toyota Prius Base
90 day: 51.18 mpg (US)
Thanks: 416
Thanked 598 Times in 438 Posts
If you see the light is going to be red when you get there, key off before arrival; that time counts toward your payback.

I know the CX is pretty light already but if there's any weight you can remove, you would see big results from not having to bring that extra mass back up to speed all the time.

First step: what's in the trunk? My younger boy was complaining about poor mileage in the truck and I pointed out that for the last three months, he'd been giving his old, to-be-tossed mattress a free tour of the city.

Lead or follow. Either is fine.
  Reply With Quote
Old 02-23-2014, 05:57 PM   #29 (permalink)
5 Gears of Fury
War_Wagon's Avatar
Join Date: Sep 2009
Location: Vancouver B.C., Canada
Posts: 1,230

Spunky - '90 Honda Civic CX
90 day: 35.56 mpg (US)
Thanks: 175
Thanked 175 Times in 137 Posts
All that stop and go, I'd scour Craigslist or the local pick-a-part yards for a set of Civic VX wheels. And some 155/80/13 tires. Even if you only found a pair of VXs, it'd be a start. Cut that unsprung rotational mass as much as possible! Synthetic oil at your next oil change couldn't hurt either, same goes for the gearbox.
"Don't look for one place to lose 100 pounds, look for 1600 places to lose an ounce." - Tony DeFeo
  Reply With Quote
Old 02-24-2014, 01:14 PM   #30 (permalink)
Should I turn here...?
Join Date: Jan 2014
Location: Port Angeles, WA
Posts: 53

Silver Civic - '96 Honda Civic CX
Thanks: 1
Thanked 17 Times in 6 Posts
In updated news, I've been getting a pretty good average of 37mpg (36ish, 38.5, 36, and I'm working on another tank which I expect to be up).

I'm definitely going to install a kill switch, I just have to find a switch that isn't too obtrusive, and wait for the weather and my schedule to clear up (I don't have a garage to work in, and it's currently snowing/raining...).

My rural town doesn't have much in the way of stop-and-go traffic jams, so I don't get much chance to "tame the wave", and I do try to avoid having to stop for lights as much as possible, and keying off when I know I'm going to have to wait at a red.

I've actually been surprised that being heavier on the accelerator pedal doesn't make a noticeable difference in my mileage. As far as shifting early, I generally hit 2nd as soon as possible, 3rd @ 20-25, 4th @ 30-35, 5th @ ~45.

I wouldn't mind having a set of lightweight wheels, but as I've mentioned before, my budget is about this big |---|. So unless they're free or under $15-20, it will break the budget. And I don't have anything extra that I'm carrying around besides the spare, toolkit, and first-aid kit. None of those are extraneous.

  Reply With Quote
Reply  Post New Thread

Thread Tools

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com