Optimal speed for the best MPG??? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 01-22-2004, 03:39 PM   #11
Sol
Senior Member
True Car Nut
 
Join Date: Sep 2002
Posts: 8,909
Thanks: 0
Thanked 0 Times in 0 Posts
Sol is on a distinguished road
Default

Quote:
Originally Posted by SSsuperchargedEi
well its best not to keep accelerating and deaccelerating at hiway speeds. i normally hit the cruise between 55 and 75, depending on the limit and weather. never bothered calcutating my mpg on a trip but ive seen 340 miles on a tank...
That'* impressive on a */C engine.
Sol is offline   Reply With Quote
Old 01-22-2004, 06:19 PM   #12
Burgundy_Boat
Guest
 
Posts: n/a
Default

the optimal speed for efficiency is determined by many things, i seriously doubt it'* 45-50 because not only does gearing and the engine play a part, but so does aerodynamics. say your going 1 MPH, your engine isn't using much fuel to go that fast (actually it'* probably idling), now you got 2 MPH using just about the same amount of fuel. while your using about the same amount of gas your going twice as fast and have just about doubled your efficiency (but it'* still shitty at that speed). now, say your going 70 and using X amount of fuel, and as before you go to double your speed to 140. you are using a heck of a lot more fuel at 140 than you are at 70. and this is were aerodynamics becomes a factor. the better the aerodynamics of the car the faster it'* optimal speed for efficiency. does that make sense or did you loose me when i said optimal the first time?
  Reply With Quote
Old 01-22-2004, 07:07 PM   #13
Senior Member
Certified Car Nut
 
Join Date: Oct 2002
Posts: 11,307
Thanks: 0
Thanked 0 Times in 0 Posts
bonnie94ssei is on a distinguished road
Default

I drove with Cruise on at 50mph coming home from Canada, and on the yellow part of the fuel gauge alone, I got 90-100 miles out of it. I was surprised I made it home (I didn't have $$ for gas)
bonnie94ssei is offline   Reply With Quote
Old 01-22-2004, 08:28 PM   #14
Senior Member
Certified GM nut
 
Join Date: Apr 2003
Location: Davison,Michigan
Posts: 1,867
Thanks: 0
Thanked 0 Times in 0 Posts
russianpolarbear is on a distinguished road
Default

In the past I have gotten about 30-32mpg @ 74mph and @1600rpm. 74 mph baby its the way to go
russianpolarbear is offline   Reply With Quote
Old 01-22-2004, 08:42 PM   #15
Senior Member
Expert Gearhead
 
Join Date: Dec 2002
Location: Mississauga, Ontario
Posts: 20,892
Thanks: 0
Thanked 1 Time in 1 Post
Jim W is on a distinguished road
Default

In my case with the V8, I found 120 kph, doing 2200 RPM I got 8L/100km and I have a 70L or 20G tank....bear in mind 4.5L in one gallon and 120 kph is 74 mph...I'm with the PolarBear on this one
Jim W is offline   Reply With Quote
Old 01-22-2004, 08:48 PM   #16
Sol
Senior Member
True Car Nut
 
Join Date: Sep 2002
Posts: 8,909
Thanks: 0
Thanked 0 Times in 0 Posts
Sol is on a distinguished road
Default

I usually set the cruise at 77. That keeps the cops away too.
Sol is offline   Reply With Quote
Old 01-22-2004, 09:58 PM   #17
Junior Member
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Custom88 is on a distinguished road
Default

Quote:
Originally Posted by Sol
Quote:
Originally Posted by SSsuperchargedEi
well its best not to keep accelerating and deaccelerating at hiway speeds. i normally hit the cruise between 55 and 75, depending on the limit and weather. never bothered calcutating my mpg on a trip but ive seen 340 miles on a tank...
That'* impressive on a */C engine.
I was thinking the opposite of that actually... 340 is my normal city mileage instead of 520 highway.
Custom88 is offline   Reply With Quote
Old 01-22-2004, 10:00 PM   #18
Sol
Senior Member
True Car Nut
 
Join Date: Sep 2002
Posts: 8,909
Thanks: 0
Thanked 0 Times in 0 Posts
Sol is on a distinguished road
Default

Holy crap. Do you have a larger tank or something?
Sol is offline   Reply With Quote
Old 01-22-2004, 10:05 PM   #19
Junior Member
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Custom88 is on a distinguished road
Default

Quote:
Originally Posted by Sol
Holy crap. Do you have a larger tank or something?
it'* a little under 20 gallons (bonneville is 18 ) but I've actually gotten 590 miles before on one tank highway driving but didn't want to risk going any further.My average is right around 520 a tank though.. now that winter is around though, I'm down to around 400. :(
Custom88 is offline   Reply With Quote
Old 01-22-2004, 10:17 PM   #20
Sol
Senior Member
True Car Nut
 
Join Date: Sep 2002
Posts: 8,909
Thanks: 0
Thanked 0 Times in 0 Posts
Sol is on a distinguished road
Default

That'* a lot of gas!
Sol is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1986 chevy c10 3 speed to 5 speed auto conversion ChevelleGalaxie500 Chevrolet 3 05-31-2016 04:32 AM
91 SSE, exh/intake/ignition for best MPG peanutbuttaguts Performance, Brainstorming & Tuning 17 10-02-2007 03:14 PM
personal best and worst mpg corvettecrazy Lounge 31 05-24-2006 08:50 PM
WCBF05 BEST of the BEST! Hand picked great photos! willwren Your Ride: GM Pictures & Videos 34 08-08-2005 03:45 AM
The MPG Post to end all MPG Posts mkaake 1992-1999 24 05-05-2005 03:25 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -4. The time now is 04:38 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.