How far have you been able to go on a tank of fuel?
7/1/08, 02:58 PM
#41
Mach 1 Member
Join Date: April 8, 2005
Posts: 681
Likes: 0
Received 0 Likes
on
0 Posts
2005 GT, spoiler delete, 5 spd manual, stock 17" Bullits/Pirellis, 3.55s, WMS Ram Air intake, SLP Loud Mouths, X-Cal II w/Bama 87 tune, Mobile 1 5-20w oil, Mobile 1 in trans and rear diff . . . 160 mi. round trip from 2550' to sea level and back . . . 421 miles per tank, computer says 28.3 mpg.
Coasting, skip shifting and every other trick in the book.
Coasting, skip shifting and every other trick in the book.
Last edited by The Lyin' King; 7/1/08 at 03:16 PM. Reason: add lube info, spelling correction
7/6/08, 08:13 AM
#43
Bullitt Member
Join Date: January 31, 2004
Location: Avon, OH
Posts: 213
Likes: 0
Received 0 Likes
on
0 Posts
Prob 75% highway.
I just did a trip 200 miles away. Reset the computer in the garage, left and had 27.1 MPG when I got there. That was going about 68 mph without the A/C on.
Then I did some city driving which dropped it down to 25.5 MPG. I used the A/C on the trip back and got home at 26.2 overall.
This was without drafting any semi's.
I did the 1-3-5 shift whenever possible. And when I went to fill up, it said 393 miles to E.
I just did a trip 200 miles away. Reset the computer in the garage, left and had 27.1 MPG when I got there. That was going about 68 mph without the A/C on.
Then I did some city driving which dropped it down to 25.5 MPG. I used the A/C on the trip back and got home at 26.2 overall.
This was without drafting any semi's.
I did the 1-3-5 shift whenever possible. And when I went to fill up, it said 393 miles to E.
7/6/08, 08:34 AM
#44
Bullitt Member
Join Date: January 31, 2004
Location: Avon, OH
Posts: 213
Likes: 0
Received 0 Likes
on
0 Posts
The 3:31 rear end (and wingless trunk 
) should get better than the 3:55, which is what I have along with 5-speed manual, and the best I ever got was 24.7 on a 95% highway trip from CT to Watkins Glen race track in NY. If I'm only 60% highway, however, my mileage drops to about 20-21 mpg average. And that's only if I baby it in the city driving. Mine has gotten as low as 17 mpg on a tankful, and when I ran it at Lime Rock park for an HPDE event, I averaged 6.8 mpg on the race track for 40 laps. 
) should get better than the 3:55, which is what I have along with 5-speed manual, and the best I ever got was 24.7 on a 95% highway trip from CT to Watkins Glen race track in NY. If I'm only 60% highway, however, my mileage drops to about 20-21 mpg average. And that's only if I baby it in the city driving. Mine has gotten as low as 17 mpg on a tankful, and when I ran it at Lime Rock park for an HPDE event, I averaged 6.8 mpg on the race track for 40 laps. http://forums.bradbarnett.net/showth...highlight=3.73
I just ran these numbers:
Stock wheel size: 235mm 55% 17"
235mm / 25.4 inches/mm = 9.252"
Diameter = 9.252" * 55% * 2 + 17" = 27.177"
Distance traveled per revolution = 3.14159 * Diameter
= 3.14159 * 27.177 inches/rev / 12 inches/foot / 5,280 feet/mile = 0.0013475 miles/rev
Shift point at 6,000 rev/min * 60 min/hour = 360,000 Rev/hour
Best Cruise Speed is very roughly about 45% of peak torque speed for this engine/load, which is 4,500 rpm * 45% = 2,025 rpm
2,025 rev/min * 60 min/hour = 121,500 rev/hour
Speeds with 4.10:1 rear axle:
1st Gear: 360,000 rev/hour * 0.0013475 miles/rev / 4.10 / 3.38 = 35 MPH
2nd Gear: 360,000 rev/hour * 0.0013475 miles/rev / 4.10 / 2.00 = 59 MPH
3rd Gear: 360,000 rev/hour * 0.0013475 miles/rev / 4.10 / 1.32 = 90 MPH
4th Gear: 360,000 rev/hour * 0.0013475 miles/rev / 4.10 / 1.00 = 118 MPH
5th Gear: 360,000 rev/hour * 0.0013475 miles/rev / 4.10 / 0.675 = 175 MPH
Cruise speed @ 2,025 rpm = 121,500 rev/hour * 0.0013475 miles/rev / 4.10 / 0.675 = 59 MPH
Guess efficiency = 24.0 miles/gallon @ 60 MPH
Speeds with 3.73:1 rear axle:
1st Gear: 360,000 rev/hour * 0.0013475 miles/rev / 3.73 / 3.38 = 38 MPH
2nd Gear: 360,000 rev/hour * 0.0013475 miles/rev / 3.73 / 2.00 = 65 MPH
3rd Gear: 360,000 rev/hour * 0.0013475 miles/rev / 3.73 / 1.32 = 99 MPH
4th Gear: 360,000 rev/hour * 0.0013475 miles/rev / 3.73 / 1.00 = 130 MPH
5th Gear: 360,000 rev/hour * 0.0013475 miles/rev / 3.73 / 0.675 = 193 MPH
Cruise speed @ 2,025 rpm = 121,500 rev/hour * 0.0013475 miles/rev / 3.73 / 0.675 = 65 MPH
Guess efficiency = 24.5 miles/gallon @ 60 MPH
Speeds with 3.55:1 rear axle:
1st Gear: 360,000 rev/hour * 0.0013475 miles/rev / 3.55 / 3.38 = 40 MPH
2nd Gear: 360,000 rev/hour * 0.0013475 miles/rev / 3.55 / 2.00 = 68 MPH
3rd Gear: 360,000 rev/hour * 0.0013475 miles/rev / 3.55 / 1.32 = 104 MPH
4th Gear: 360,000 rev/hour * 0.0013475 miles/rev / 3.55 / 1.00 = 137 MPH
5th Gear: 360,000 rev/hour * 0.0013475 miles/rev / 3.55 / 0.675 = 202 MPH
Cruise speed @ 2,025 rpm = 121,500 rev/hour * 0.0013475 miles/rev / 3.55 / 0.675 = 68 MPH
Guess efficiency = 24.9 miles/gallon @ 60 MPH
Speeds with 3.31:1 rear axle:
1st Gear: 360,000 rev/hour * 0.0013475 miles/rev / 3.31 / 3.38 = 43 MPH
2nd Gear: 360,000 rev/hour * 0.0013475 miles/rev / 3.31 / 2.00 = 73 MPH
3rd Gear: 360,000 rev/hour * 0.0013475 miles/rev / 3.31 / 1.32 = 111 MPH
4th Gear: 360,000 rev/hour * 0.0013475 miles/rev / 3.31 / 1.00 = 147 MPH
5th Gear: 360,000 rev/hour * 0.0013475 miles/rev / 3.31 / 0.675 = 217 MPH
Cruise speed @ 2,025 rpm = 121,500 rev/hour * 0.0013475 miles/rev / 3.31 / 0.675 = 73 MPH
Guess efficiency = 25.0 miles/gallon @ 60 MPH
Specs on the Transmission Ratios are found here, on page 8:
http://www.fileden.com/files/2008/3/...ng%20Specs.pdf
7/10/08, 07:47 PM
#45
Legacy TMS Member
As of right now I get 350-375 per tank with a v8 five speed. She has 35k on her and I run a JLT cai w/bama 93 tune, SLP Loudmouth axle backs and Royal Purple XPR 5W20 motor oil. When I first got her I took it to visit a friend in Conn several times and got 33 mpg all the time. When I bought it new in 04 was getting about 14 mpg my first 2 years with her because I only lived 7 miles from work and beat the **** out of it every mile.
I still work for the same company but at another location farther from home. My driving now is mostly highway at 55-65 mph with every SUV, Pickup, hybrid
you name it passing me like i'm driving in wet cement
. Only have to fill up my tank once a week which sets me back about $55
.
I still work for the same company but at another location farther from home. My driving now is mostly highway at 55-65 mph with every SUV, Pickup, hybrid you name it passing me like i'm driving in wet cement. Only have to fill up my tank once a week which sets me back about $55.
7/12/08, 10:00 AM
#47
Cobra Member
Join Date: November 27, 2004
Location: Albuquerque, New Mexico
Posts: 1,303
Likes: 0
Received 2 Likes
on
2 Posts
In town, with my daily commute, I have been averaging 19.1 mpg over the last two years.
On road trips, the best I have done was a bit over 360 miles and just under 28 mpg. I could have gone 400 miles on that tank (before hitting reserves), but I was heading home and I definitely didn't want to see if I could make it to the next town (70 miles away!) before I was walking.
On road trips, the best I have done was a bit over 360 miles and just under 28 mpg. I could have gone 400 miles on that tank (before hitting reserves), but I was heading home and I definitely didn't want to see if I could make it to the next town (70 miles away!) before I was walking.
7/15/08, 06:00 AM
#49
Legacy TMS Member
I've managed 26.5 mpg over the course of 360 miles or so. I might have been able to make it another 40 miles with the reserve in the tank but I still had another 80 miles or so on my trip so I stopped to fill back up. Computer told me I had 370 miles till empty when I filled back up. That was bone stock. Its very difficult to see that milage with CR's agressive throttle mapping
7/15/08, 03:57 PM
#51
Legacy TMS Member
You have the interior upgrade package? I do and it starts b*tching at me at 50 miles to E and every 8 or 9 miles thereafter. I give in and fill it up before it gets to that point.
7/15/08, 05:36 PM
#52
Join Date: May 31, 2007
Location: Washington DC Metro Area
Posts: 1,201
Likes: 0
Received 0 Likes
on
0 Posts
FYI - just noticed this a few months ago, but I noticed the reminder comes on exactly every 10 minutes.
7/17/08, 08:03 AM
#54
Mach 1 Member
Join Date: July 16, 2004
Location: Greenfield In.
Posts: 851
Likes: 0
Received 0 Likes
on
0 Posts
I find its very hard to get the tank filled up to exactly the same level that I had the last time. Every station has a different pump handle and it will shut off at different times. Even if you play with it and fill it up till it spills on the ground I guess that is the best measure but I dont recommend this. I trust the computer and it is usually right on within about a half a mile per gallon when I do the math at the pump.
Thread
Thread Starter
Forum
Replies
Last Post
unnoticedtrails
Repair and Service Help
30
7/17/17 11:10 AM