Factoring in changes in height. - Fuelly Forums

Click here to see important news regarding the aCar App

Thread Tools Display Modes
Old 04-21-2007, 03:29 PM   #1
Registered Member
omgwtfbyobbq's Avatar
Join Date: Jul 2006
Posts: 1,516
Country: United States
Factoring in changes in height.

I thought this was nifty, and should allow for testing tomorrow. Recently, I made a very long trip, and should return to the same gas station by dropping ~1500ft. Since going uphill hurts mileage, going downhill should help. But by how much. We know potential energy is expressed as mgh, with mg equaling ~15,000 Newtons in my case. Over 1500ft, or ~450 Meters, this should be equal to ~15,000*450=~6800000W=~6800kW, or ~2kWh. Now, since the engine only operates at ~10-20% efficiency at most, those 2kwh are equal to ~10-20kwh worth of gasoline. If every gallon has ~34kWh, that's a third to two thirds of a gallon of gas worth of PE. If I get ~33mpg at a cruise, over 100 miles I'll use ~3 gallons. But, since I'm getting that PE boost, I'll only need two and a third to two and two thirds, and will probably see ~40mpg. This isn't exactly exact, but I though it was neat approximating how much elevation can change mileage. And it's testable too!

Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
omgwtfbyobbq is offline   Reply With Quote
Old 04-21-2007, 04:31 PM   #2
Registered Member
trebuchet03's Avatar
Join Date: Mar 2007
Posts: 812
Country: United States
Send a message via AIM to trebuchet03
Originally Posted by omgwtfbyobbq View Post
...This isn't exactly exact, ...
That's now tomorrow's phrase of the day... It made me smile and I feel that I need to integrate into tomorrow's rhetoric somehow :P
Time is the best teacher. Unfortunately it kills all its students.

Bike Miles (Begin Aug. 20 - '07): ~433.2 miles

trebuchet03 is offline   Reply With Quote

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

» Fuelly iOS Apps
No Threads to Display.
Powered by vBadvanced CMPS v3.2.3

All times are GMT -8. The time now is 12:20 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.