Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 05-23-2008, 12:14 AM   #11 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,275

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.07 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)
Thanks: 3,811
Thanked 6,693 Times in 3,469 Posts
You may be on to something with the P&G angle.

After seeing what you've seen, are you motivated to do further weight reduction?

Believe me, if I could easily do the siphon trick on my car, I would. (I've tried, but the filler pipe has a bend in it that confounded my attempts.)

__________________
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: Oops, I did it again! Bought another cheap, 3-cylinder Mirage. Mods in progress...
Ecodriving test: Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 05-23-2008, 04:24 AM   #12 (permalink)
EcoModding Apprentice
 
Join Date: May 2008
Location: Mito, Japan
Posts: 106

The Move - '99 Daihatsu Move Aero Down Custom XX
90 day: 29.89 mpg (US)
Thanks: 0
Thanked 1 Time in 1 Post
Send a message via AIM to Dust
remember that fuel pumps are cooled by fuel. If there isn’t anything to cool it off, it may burn up. Also, if your car has a return fuel line, the fuel being sent back will be heated too.
  Reply With Quote
Old 05-23-2008, 10:12 AM   #13 (permalink)
EV test pilot
 
bennelson's Avatar
 
Join Date: Jan 2008
Location: Oconomowoc, WI, USA
Posts: 4,435

Electric Cycle - '81 Kawasaki KZ440
90 day: 334.6 mpg (US)

S10 - '95 Chevy S10
90 day: 30.48 mpg (US)

Electro-Metro - '96 Ben Nelson's "Electro-Metro"
90 day: 129.81 mpg (US)

The Wife's Car - Plug-in Prius - '04 Toyota Prius
90 day: 78.16 mpg (US)
Thanks: 17
Thanked 658 Times in 384 Posts
Next thing you know, people will be swapping out for SMALLER gas tanks!!!

Seriously though, if you have a car that gets 100 MPG, who needs anything bigger than, say, a three gallon tank?

Motorcycles only carry a couple gallons, and many don't even have a fuel gauge.
__________________


300mpg.org Learn how to BUILD YOUR OWN ELECTRIC CAR CHEAP
My YouTube Videos
  Reply With Quote
Old 05-23-2008, 10:47 AM   #14 (permalink)
EcoModding Newbie
 
Join Date: Apr 2008
Location: Southern Ontario
Posts: 284

Parachute - '03 Chevrolet Tracker LX
90 day: 28.55 mpg (US)

Peon - '95 Plymouth Neon Highline baby!
90 day: 31.39 mpg (US)

Slocus Wagon - '06 Ford Focus SE
Thanks: 0
Thanked 2 Times in 2 Posts
I'm not arguing about your results but isn't there some benefit to extra mass for pulse and gliding?
Or really mass vs. wind resistance, especially if you have a rolling hills commute? or a powerful engine?
I guess what I'm trying to say is that you could use your cars mass plus a hill to create a flywheel effect. You are storing gravitational energy going up and releasing it going down increasing your glide distance and velocity.

For my commute I haven't really changed my average speed very much hypermiling, but by pulse and gliding with the hills I have improved my mileage by 1/6th.

I would try adding weight to my Neon but it rides near the bumpstops as is. My tracker is so underpowered that adding weight would force me to downshift on many hills probably erasing any benefits of better gliding.
Ian
__________________


  Reply With Quote
Old 05-23-2008, 11:04 AM   #15 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,320

PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

PaleFit - '09 Honda Fit Sport
Team Honda
Wagons
90 day: 44.06 mpg (US)
Thanks: 611
Thanked 428 Times in 280 Posts
I do notice longer glides when it's full compared to empty. But I think the losses along the way more than equal the gliding gains. It takes more engine output to accelerate the higher mass, and the engine, as we know, is nothing close to efficient.

I think....
__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
  Reply With Quote
Old 05-23-2008, 01:34 PM   #16 (permalink)
Depends on the Day
 
RH77's Avatar
 
Join Date: Nov 2007
Location: Kansas City Area
Posts: 1,761

Teggy - '98 Acura Integra LS
Sports Cars
90 day: 32.74 mpg (US)

IMA - '10 Honda Insight EX
Team Honda
90 day: 34.76 mpg (US)

Tessie - '06 Acura TSX Base
90 day: 28.2 mpg (US)
Thanks: 31
Thanked 41 Times in 35 Posts
I'm generally concerned about evaporate pollution from filling-up too often. We get quite a few "Ozone Alert" days in the Summer, so we know it's a problem. I let it get close to E and completely refill. Better for FE tracking too.

On my last tank (a near best 41.6) I had a passenger for 50 of those miles. For my car, the average adult weighs more than a full tank, so there has to be something to momentum with my driving style (it was mostly highway driving, which, from what I've observed, is benefited by extra weight).

RH77
__________________
“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein

_
_
  Reply With Quote
Old 05-23-2008, 02:24 PM   #17 (permalink)
Impatient Driver
 
chrislk1986's Avatar
 
Join Date: May 2008
Location: Whidbey, WA
Posts: 21

98CivicHX - '98 Honda Civic HX
90 day: 40.02 mpg (US)
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via MSN to chrislk1986
I think by the time you start getting lower on gas, you try and milk it for whatever you can. I know when I get to 1/2 tank I'll put a lot more effort into driving efficient.

But I've also heard there may be something to do with surface tension or the surface area of the gas. I'll ask my friend where he got that info. Anyone else heard of that?

Chris
__________________


  Reply With Quote
Old 05-23-2008, 02:25 PM   #18 (permalink)
coasting....
 
Join Date: May 2008
Location: West Coast
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Competiton sailplanes use water ballast to improve their penetration, however the L/D (lift-vs-drag) remains more or less fixed. In sailplanes the main reason you now see uber-slick planes is that the cleaner planes can escape sink faster than the "gas-bag" floater.

I agree the coast-down angle should be investigated, but I would think in any practical use, the reality of start-stop driving would negate any advantage to increased weight.

And yeah, if you got 100 mpg, you could go with a 2-3 gallon tank, and then you could carry less fuel, then you could use that space for more storage, or reduce the overall size of the car, thus reducing more weight, etc.
  Reply With Quote
Old 05-24-2008, 04:53 PM   #19 (permalink)
Legend in my own mind
 
trikkonceptz's Avatar
 
Join Date: Apr 2008
Location: Homestead, Fl.
Posts: 927

Evil Pumpkin - '08 Scion xD RS 1.0 #1633
90 day: 35.45 mpg (US)

Silent Silver Killer - '10 Honda Insight EX
90 day: 51.5 mpg (US)
Thanks: 2
Thanked 13 Times in 12 Posts
Theoretically I agree with your results, but I have a question. How can you keep accurate mileage by not filing it up? Sure you can control the amount of fuel you put in, but unless you have a digital gauge that displays remaining fuel accurately how can you consistently measure the amount of fuel you used to calculate mpg's?
__________________
Thx NoCO2; "The biggest FE mod you can make is to adjust the nut behind the wheel"

I am a precisional instrument of speed and aeromatics
If your knees bent in the opposite direction......what would a chair look like???





  Reply With Quote
Old 05-24-2008, 05:09 PM   #20 (permalink)
Master EcoModder
 
Join Date: Jan 2008
Location: Sacramento, CA
Posts: 401
Thanks: 34
Thanked 139 Times in 103 Posts
Trik..,
As long as you keep track of how much gas you put in the tank and how many miles you have driven, you can get a relatively accurate mpg reading over time. Say maybe 1000-2000 miles. I agree it would be more difficult for each "tankful". That is what the ScanGuage can be used for.
JJ

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com