Interstate drivers
3rd Gear Member
Joined: Nov 2006
Posts: 983
From: New Jersey
RE: Interstate drivers
ORIGINAL: thaztrain35
yeah but who drives a mustang 55-65 miles per hour[:'(] lol...
yeah but who drives a mustang 55-65 miles per hour[:'(] lol...
Well, I'm not admitting to breaking any laws, but I do believe that some folks drive their Mustangs 55- 65 miles per hour- but mostly in 35-40 zones..........
2nd Gear Member
Joined: Sep 2007
Posts: 330
From:
RE: Interstate drivers
ORIGINAL: 06Saleen3V
I do for the most part on really long trips...less rock chips and less gas consumption...this isnt to say that dont punch it to 100+mph when it's necessary
ORIGINAL: thaztrain35
yeah but who drives a mustang 55-65 miles per hour[:'(] lol...
yeah but who drives a mustang 55-65 miles per hour[:'(] lol...
2nd Gear Member
Joined: Aug 2007
Posts: 464
From: Illinois
RE: Interstate drivers
I have an 07 GT Auto with a 373 gear installed and lately I have been averaging about 18 to 19 miles per gallon between fill ups, Thats setting the cruiz at 65. I dont see how you guys are getting that kind of milage.
Joined: Oct 2006
Posts: 44
From:
RE: Interstate drivers
I'm bored off my @ss tonite, so that's my excuse for the following (plus I'm a dorky engineer)...
The drag force caused by air resistance is directly proportional to velocity (speed) squared. This means that gas mileage should decrease more as you go faster (not at the same rate you increase speed). Basically you need more engine power to keep a constant speed as you go faster, and more engine power typically equates to more gas consumption. The drag force is more pronounced at higher speeds (60+ mph), so going slower than that doesn't have as much affect (regarding drag).
With that being said, let's do an example. My assumptions are that gas mileage (mpg) decreases 5% for every 5 mph over 60 mph, and the gas mileage starts at 25 mpg at 60 mph. I also assume that you are not drafting a big rig.
Trip distance = 300 miles
Gas price = $3.50 per gallon
speed (mph): 60 65 70 75 80
time (hrs): 5.0 4.6 4.3 4.0 3.8
mileage (mpg): 25.0 23.8 22.6 21.4 20.4
gallons used: 12.0 12.6 13.3 14.0 14.7
total cost: $42.00 $44.21 $46.54 $48.99 $51.56
I think these numbers are close to realistic. I have seen 25-27 mpg when cruising on the highway at 60 mph, and 22-24 when going faster than that (65-70).
So, is it worth an extra $9.56 to get to your destination 1.2 hrs (1 hr, 12 min) faster by going 80 instead of 60? Keep in mind my price of gas is slightly on the high side, so total cost would be a little lower as you go faster.
You could even do a "risk-vs-reward" cost analysis to figure out if speeding is actually worth it, even if you get at ticket. In other words, you could figure out chances of getting caught, how much the ticket would be, how much insurance would go up, how much time you'd save by speeding, etc.
Disclaimer: I am not promoting illegal activities, and I do not assume liability for anyone caught speeding!
The drag force caused by air resistance is directly proportional to velocity (speed) squared. This means that gas mileage should decrease more as you go faster (not at the same rate you increase speed). Basically you need more engine power to keep a constant speed as you go faster, and more engine power typically equates to more gas consumption. The drag force is more pronounced at higher speeds (60+ mph), so going slower than that doesn't have as much affect (regarding drag).
With that being said, let's do an example. My assumptions are that gas mileage (mpg) decreases 5% for every 5 mph over 60 mph, and the gas mileage starts at 25 mpg at 60 mph. I also assume that you are not drafting a big rig.
Trip distance = 300 miles
Gas price = $3.50 per gallon
speed (mph): 60 65 70 75 80
time (hrs): 5.0 4.6 4.3 4.0 3.8
mileage (mpg): 25.0 23.8 22.6 21.4 20.4
gallons used: 12.0 12.6 13.3 14.0 14.7
total cost: $42.00 $44.21 $46.54 $48.99 $51.56
I think these numbers are close to realistic. I have seen 25-27 mpg when cruising on the highway at 60 mph, and 22-24 when going faster than that (65-70).
So, is it worth an extra $9.56 to get to your destination 1.2 hrs (1 hr, 12 min) faster by going 80 instead of 60? Keep in mind my price of gas is slightly on the high side, so total cost would be a little lower as you go faster.
You could even do a "risk-vs-reward" cost analysis to figure out if speeding is actually worth it, even if you get at ticket. In other words, you could figure out chances of getting caught, how much the ticket would be, how much insurance would go up, how much time you'd save by speeding, etc.
Disclaimer: I am not promoting illegal activities, and I do not assume liability for anyone caught speeding!
2nd Gear Member
Joined: Mar 2007
Posts: 408
From: Greater Philadelphia area
RE: Interstate drivers
ORIGINAL: dewittalday
I'm bored off my @ss tonite, so that's my excuse for the following (plus I'm a dorky engineer)...
The drag force caused by air resistance is directly proportional to velocity (speed) squared. This means that gas mileage should decrease more as you go faster (not at the same rate you increase speed). Basically you need more engine power to keep a constant speed as you go faster, and more engine power typically equates to more gas consumption. The drag force is more pronounced at higher speeds (60+ mph), so going slower than that doesn't have as much affect (regarding drag).
With that being said, let's do an example. My assumptions are that gas mileage (mpg) decreases 5% for every 5 mph over 60 mph, and the gas mileage starts at 25 mpg at 60 mph. I also assume that you are not drafting a big rig.
Trip distance = 300 miles
Gas price = $3.50 per gallon
speed (mph): 60 65 70 75 80
time (hrs): 5.0 4.6 4.3 4.0 3.8
mileage (mpg): 25.0 23.8 22.6 21.4 20.4
gallons used: 12.0 12.6 13.3 14.0 14.7
total cost: $42.00 $44.21 $46.54 $48.99 $51.56
I think these numbers are close to realistic. I have seen 25-27 mpg when cruising on the highway at 60 mph, and 22-24 when going faster than that (65-70).
So, is it worth an extra $9.56 to get to your destination 1.2 hrs (1 hr, 12 min) faster by going 80 instead of 60? Keep in mind my price of gas is slightly on the high side, so total cost would be a little lower as you go faster.
You could even do a "risk-vs-reward" cost analysis to figure out if speeding is actually worth it, even if you get at ticket. In other words, you could figure out chances of getting caught, how much the ticket would be, how much insurance would go up, how much time you'd save by speeding, etc.
Disclaimer: I am not promoting illegal activities, and I do not assume liability for anyone caught speeding!
I'm bored off my @ss tonite, so that's my excuse for the following (plus I'm a dorky engineer)...
The drag force caused by air resistance is directly proportional to velocity (speed) squared. This means that gas mileage should decrease more as you go faster (not at the same rate you increase speed). Basically you need more engine power to keep a constant speed as you go faster, and more engine power typically equates to more gas consumption. The drag force is more pronounced at higher speeds (60+ mph), so going slower than that doesn't have as much affect (regarding drag).
With that being said, let's do an example. My assumptions are that gas mileage (mpg) decreases 5% for every 5 mph over 60 mph, and the gas mileage starts at 25 mpg at 60 mph. I also assume that you are not drafting a big rig.
Trip distance = 300 miles
Gas price = $3.50 per gallon
speed (mph): 60 65 70 75 80
time (hrs): 5.0 4.6 4.3 4.0 3.8
mileage (mpg): 25.0 23.8 22.6 21.4 20.4
gallons used: 12.0 12.6 13.3 14.0 14.7
total cost: $42.00 $44.21 $46.54 $48.99 $51.56
I think these numbers are close to realistic. I have seen 25-27 mpg when cruising on the highway at 60 mph, and 22-24 when going faster than that (65-70).
So, is it worth an extra $9.56 to get to your destination 1.2 hrs (1 hr, 12 min) faster by going 80 instead of 60? Keep in mind my price of gas is slightly on the high side, so total cost would be a little lower as you go faster.
You could even do a "risk-vs-reward" cost analysis to figure out if speeding is actually worth it, even if you get at ticket. In other words, you could figure out chances of getting caught, how much the ticket would be, how much insurance would go up, how much time you'd save by speeding, etc.
Disclaimer: I am not promoting illegal activities, and I do not assume liability for anyone caught speeding!
I wonder how this might compare to agressive driving conditions such as road course or strip.
Ok, I will stop....
2nd Gear Member
Joined: Oct 2006
Posts: 444
From: Pensacola NAS, Florida
RE: Interstate drivers
I Drive on the highway a lot... I found I get 26 to 28 mpg at 75 mph, any higher it drops down... I never drive really any slower... so i can't help with that.
I try to average 75 - 80 for best fuel economy and getting to where I'm going in a decent time.
I try to average 75 - 80 for best fuel economy and getting to where I'm going in a decent time.
5th Gear Member
Joined: Dec 2006
Posts: 4,552
From: Redding, CA
RE: Interstate drivers
Before the turbo I would get 21.5 mpg @78 mph. If I cruised between 55-67 I would get 24ish. This was with 4.10's 295/35/18's, JLT2 and an SCT tune.
After the turbo I get 25.5 at 70 and 24.8-25.0 @ 80. I did get 26.5 @ 80 the other day but I may had a tail wind. This is still with the 4.10's.
After the turbo I get 25.5 at 70 and 24.8-25.0 @ 80. I did get 26.5 @ 80 the other day but I may had a tail wind. This is still with the 4.10's.
6th Gear Member
Joined: Sep 2006
Posts: 11,005
From: Canton, Georgia
RE: Interstate drivers
with the cruise set @ +/-65mph, I get around 27.7mpg and @ +/-85mph, I get around 25.5mpg
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