Go Back   EcoModder Forum > EcoModding > General Efficiency Discussion
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 01-12-2019, 06:12 PM   #31 (permalink)
Master EcoModder
 
mpg_numbers_guy's Avatar
 
Join Date: Feb 2018
Location: Michigan/Virginia
Posts: 779

Dreamsight - '06 Honda Insight MT
Team Honda
Gen-1 Insights
90 day: 82.95 mpg (US)

Mom's Prius (my driving) - '08 Toyota Prius Base w/ Package 5
Team Toyota
90 day: 55.37 mpg (US)

Dreamsight (Pizza Delivery) - '06 Honda Insight MT
Team Honda
Gen-1 Insights
90 day: 76.16 mpg (US)
Thanks: 197
Thanked 203 Times in 162 Posts
As a relevant comparison, between today and yesterday's trips my Insight got 82.9 MPG driving on "normal" roads (flat + slight hills) and "only" 73.7 MPG through mountain passes. MPG was lower because I couldn't maintain lean burn for 80%-90% of the passes.

__________________
- 2006 New Formula Red Honda Insight MT: (Build thread)


Retired vehicles lifetime MPG:
- Ecomodded automatic '04 Honda Civic EX sedan: 46 MPG (38 MPG delivery driving)
- Unmodified '04 Toyota Sienna: 32 MPG
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 01-19-2019, 03:55 PM   #32 (permalink)
EcoModding Apprentice
 
Join Date: Aug 2008
Location: Everett WA
Posts: 124
Thanks: 6
Thanked 18 Times in 16 Posts
My 1979 Plymouth Champ never got higher MPG(50.1) than the 962 mile drive from Browning, Montana (4400 feet) to Superior, Wisconsin (630 feet). The drop must have did some good.... maybe the westerlies too. My 1988 Ford Festiva traveling the 380 mile North Cascade loop, over Washington Pass & Stevens Pass, got 50MPG, with 11,000+ feet of ups & downs. Another time however, I had a 57 MPG tank of gas, in the lowlands over 2 days & cool-downs!

Last edited by litesong; 01-19-2019 at 04:53 PM..
  Reply With Quote
Old 01-20-2019, 03:04 PM   #33 (permalink)
Master EcoModder
 
Join Date: Jun 2008
Location: Earth
Posts: 5,202
Thanks: 225
Thanked 801 Times in 587 Posts
Quote:
Originally Posted by mpg_numbers_guy View Post
As a relevant comparison, between today and yesterday's trips my Insight got 82.9 MPG driving on "normal" roads (flat + slight hills) and "only" 73.7 MPG through mountain passes. MPG was lower because I couldn't maintain lean burn for 80%-90% of the passes.
That's been my experience with the Insight, too. Used to regularly drive over Carson Pass (California 88) then Altamont Pass into San Jose, and would get mid-70s for the round trip. But a flatter* drive out US 50 &c to the Toiyabe Range would get in the low 80s.

And of course the one-way trips downhill from the top of Carson Pass would see me getting 150 mph (the highest the Insight's gauge will show) for 50-60 miles :-)

*I do realize that my idea of "hills" may differ from the norm :-)
  Reply With Quote
Old 01-20-2019, 03:23 PM   #34 (permalink)
Master EcoModder
 
Ecky's Avatar
 
Join Date: Dec 2011
Location: Vermont
Posts: 3,286

Gaptooth - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 54.26 mpg (US)

Such Fit - '07 Honda Fit Sport
90 day: 41.27 mpg (US)

Connect - '15 Ford Transit Connect XL
90 day: 23.99 mpg (US)
Thanks: 1,166
Thanked 1,297 Times in 830 Posts
Quote:
Originally Posted by mpg_numbers_guy View Post
As a relevant comparison, between today and yesterday's trips my Insight got 82.9 MPG driving on "normal" roads (flat + slight hills) and "only" 73.7 MPG through mountain passes. MPG was lower because I couldn't maintain lean burn for 80%-90% of the passes.
I have to wonder if your mountains aren't smaller than ours.

When I was down in MA my fuel economy improved from ~58mpg to upper 80's. It was a little warmer but I expect most of that is from things being less mountainous. It's frequently necessary to be in 3rd gear WoT to maintain speed in my car on Vermont highways, forget about lean burn.
  Reply With Quote
Old 01-20-2019, 06:57 PM   #35 (permalink)
Master EcoModder
 
skyking's Avatar
 
Join Date: Apr 2011
Location: Tacoma WA
Posts: 1,261

Woody - '96 Dodge Ram 2500 SLT
Team Cummins
90 day: 23.82 mpg (US)

Avion and Woody - '96 Dodge/Avion Ram 2500/5th wheel combo
90 day: 15.1 mpg (US)

TD eye eye eye - '03 Volkswagen Beetle GLS
90 day: 49.05 mpg (US)

Mule - '07 Dodge Ram 3500 ST
Thanks: 529
Thanked 450 Times in 289 Posts
The more modern injected engines get the most benefit on the hilly sections due to Deceleration Fuel Cut-Off. Engines with carburetors still use ( waste ) a little fuel even with the throttle closed, but injected engines can shut that right off with DFCO.
__________________




2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle

currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears
  Reply With Quote
Old 01-20-2019, 08:56 PM   #36 (permalink)
Master EcoModder
 
mpg_numbers_guy's Avatar
 
Join Date: Feb 2018
Location: Michigan/Virginia
Posts: 779

Dreamsight - '06 Honda Insight MT
Team Honda
Gen-1 Insights
90 day: 82.95 mpg (US)

Mom's Prius (my driving) - '08 Toyota Prius Base w/ Package 5
Team Toyota
90 day: 55.37 mpg (US)

Dreamsight (Pizza Delivery) - '06 Honda Insight MT
Team Honda
Gen-1 Insights
90 day: 76.16 mpg (US)
Thanks: 197
Thanked 203 Times in 162 Posts
Quote:
Originally Posted by jamesqf View Post
And of course the one-way trips downhill from the top of Carson Pass would see me getting 150 mph (the highest the Insight's gauge will show) for 50-60 miles :-)
But what is it on the return trip?

Quote:
Originally Posted by jamesqf View Post
*I do realize that my idea of "hills" may differ from the norm :-)
Michigan doesn't have a lot of crazy hills, but those mountain passes in WV are insane. Definitely steeper than in Tennessee and out west. Can't compare to Vermont though. Closest I've been to is NY, and that was only the west part, and I had my Civic then.

Quote:
Originally Posted by Ecky View Post
I have to wonder if your mountains aren't smaller than ours.

When I was down in MA my fuel economy improved from ~58mpg to upper 80's. It was a little warmer but I expect most of that is from things being less mountainous. It's frequently necessary to be in 3rd gear WoT to maintain speed in my car on Vermont highways, forget about lean burn.
This was actually through the steep mountain passes in West Virginia. 3rd gear at 80%+ load getting 30-40 MPG was frequently necessary to climb the hills. On some hills I could maintain 45-55 MPG if I got enough momentum on the downgrade.

Through Michigan and elsewhere where there aren't any mountain passes I got 80+ MPG like you did in MA.

I also let my speed dip down to as low as 40 MPH on the inclines if there is no traffic. On the downhill my MPG is always above 100, and I sometimes reach incriminating speeds, which helps maintain momentum and get better MPG. Being able to bleed off 35 MPH from 75 to 40 allows me to use less throttle going uphill. I also downshift before the hill to keep the RPMs around 2000 (2000 RPM in 3rd gear is better MPG AND power than 1500 or so RPM in 4th gear going uphill, probably BSFC related voodoo ). That's probably the biggest reason why I was able to get the 73.7 MPG through the passes.

Most of the traffic on I-64 is truckers, who on mountain grades aren't going much faster than I am, so I don't mind going that slow near the top of the pass. If I tried to maintain 55 MPH going up the passes my fuel economy would definitely be lower, but if I did that, then I would have to use engine braking on the downhill to avoid reaching dangerous speeds, and DFCO's savings over neutral coasting doesn't make up for losing 5-15 MPG on the incline. 40 MPH uphill and 75 MPH downhill, if split evenly, is an average speed of 56.25 MPH, which is pretty much the same speed I averaged outside the mountains.
__________________
- 2006 New Formula Red Honda Insight MT: (Build thread)


Retired vehicles lifetime MPG:
- Ecomodded automatic '04 Honda Civic EX sedan: 46 MPG (38 MPG delivery driving)
- Unmodified '04 Toyota Sienna: 32 MPG
  Reply With Quote
The Following User Says Thank You to mpg_numbers_guy For This Useful Post:
Ecky (01-20-2019)
Old 01-21-2019, 12:39 AM   #37 (permalink)
Tyrant-at-large
 
Vman455's Avatar
 
Join Date: Feb 2012
Location: Champaign, IL
Posts: 1,267

Little Red - retired - '05 Honda Civic EX
90 day: 49.03 mpg (US)

Pope Pious the Prius - '13 Toyota Prius Two
Team Toyota
90 day: 48.97 mpg (US)
Thanks: 117
Thanked 1,050 Times in 542 Posts
Quote:
Originally Posted by mpg_numbers_guy View Post
40 MPH uphill and 75 MPH downhill, if split evenly, is an average speed of 56.25 MPH, which is pretty much the same speed I averaged outside the mountains.
Not quite! There was a similar problem on my physics homework this week.

If you traveled the same time at each speed, your average speed would be the arithmetic mean of 40 and 75, or 57.5 mph. But since we're assuming an equal distance at each speed--up the mountain and down the other side--your average speed is the harmonic mean:

2/((1/40)+(1/75)) = 52.1739... mph

Of course, that's assuming instant acceleration for the sake of simplicity, which means that estimate is a little high.
__________________

  Reply With Quote
The Following User Says Thank You to Vman455 For This Useful Post:
mpg_numbers_guy (01-21-2019)
Old 01-21-2019, 09:32 AM   #38 (permalink)
Master EcoModder
 
mpg_numbers_guy's Avatar
 
Join Date: Feb 2018
Location: Michigan/Virginia
Posts: 779

Dreamsight - '06 Honda Insight MT
Team Honda
Gen-1 Insights
90 day: 82.95 mpg (US)

Mom's Prius (my driving) - '08 Toyota Prius Base w/ Package 5
Team Toyota
90 day: 55.37 mpg (US)

Dreamsight (Pizza Delivery) - '06 Honda Insight MT
Team Honda
Gen-1 Insights
90 day: 76.16 mpg (US)
Thanks: 197
Thanked 203 Times in 162 Posts
Thanks for the correction! Looks like I plugged in 45 MPH and 75 MPH instead of 40 MPH and 75 MPH. 52.17 MPH is correct.

That's also assuming 75 MPH is the highest speed I reached on the downhills.
__________________
- 2006 New Formula Red Honda Insight MT: (Build thread)


Retired vehicles lifetime MPG:
- Ecomodded automatic '04 Honda Civic EX sedan: 46 MPG (38 MPG delivery driving)
- Unmodified '04 Toyota Sienna: 32 MPG
  Reply With Quote
Old 01-21-2019, 10:13 AM   #39 (permalink)
Tyrant-at-large
 
Vman455's Avatar
 
Join Date: Feb 2012
Location: Champaign, IL
Posts: 1,267

Little Red - retired - '05 Honda Civic EX
90 day: 49.03 mpg (US)

Pope Pious the Prius - '13 Toyota Prius Two
Team Toyota
90 day: 48.97 mpg (US)
Thanks: 117
Thanked 1,050 Times in 542 Posts
Quote:
Originally Posted by mpg_numbers_guy View Post
That's also assuming 75 MPH is the highest speed I reached on the downhills.
I remember one trip to Oklahoma City in the Civic, coasting down the hills in Missouri with the engine off, zipping past all the pickups that had just passed me going uphill--allegedly.
__________________

  Reply With Quote
Old 01-21-2019, 10:20 AM   #40 (permalink)
Master EcoModder
 
mpg_numbers_guy's Avatar
 
Join Date: Feb 2018
Location: Michigan/Virginia
Posts: 779

Dreamsight - '06 Honda Insight MT
Team Honda
Gen-1 Insights
90 day: 82.95 mpg (US)

Mom's Prius (my driving) - '08 Toyota Prius Base w/ Package 5
Team Toyota
90 day: 55.37 mpg (US)

Dreamsight (Pizza Delivery) - '06 Honda Insight MT
Team Honda
Gen-1 Insights
90 day: 76.16 mpg (US)
Thanks: 197
Thanked 203 Times in 162 Posts
Quote:
Originally Posted by Vman455 View Post
I remember one trip to Oklahoma City in the Civic, coasting down the hills in Missouri with the engine off, zipping past all the pickups that had just passed me going uphill--allegedly.
Yup! Although since I was pretty much going as slow as the truckers uphill, their weight gave them more momentum on the downhill, but they kept hitting their brakes for some reason, imagine that , so I passed 'em.

Also those people that pass you five times because they keep stopping for stuff while you just keep truckin' along.

Slower speed doesn't always mean a longer trip.

__________________
- 2006 New Formula Red Honda Insight MT: (Build thread)


Retired vehicles lifetime MPG:
- Ecomodded automatic '04 Honda Civic EX sedan: 46 MPG (38 MPG delivery driving)
- Unmodified '04 Toyota Sienna: 32 MPG
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com