LT1 fuel mileage question
05-05-2019, 03:59 PM
#1
LT1 fuel mileage question just wondering what people are getting for mileage with similar mods or if I just drive like an *** hahaha. Averaging 15-16 mpg around town, very few highway miles. 1995 firebird lt1, M6, 3.42s, cc503, 1.6rr, k&N cold air, long tubes, magnaflow no cats, tuned by moe, 17x9.5 rims, NT05s, tubular suspension, sfc's. thank you in advance.
05-07-2019, 08:31 PM
#2
TECH Apprentice
I'm getting between 15 and 20 mph depending on how I romp it. Full bolt ons t56, no cam though. I know I'm running pretty rich. Rather be a little rich than lean in my opinion.
05-08-2019, 02:03 PM
#3
12 Second Club
just wondering what people are getting for mileage with similar mods or if I just drive like an *** hahaha. Averaging 15-16 mpg around town, very few highway miles. 1995 firebird lt1, M6, 3.42s, cc503, 1.6rr, k&N cold air, long tubes, magnaflow no cats, tuned by moe, 17x9.5 rims, NT05s, tubular suspension, sfc's. thank you in advance.
I tried to drive conservatively and my mileage didn't seem to change, so I resumed my previous driving habits.
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05-09-2019, 06:52 AM
#9
On The Tree
05-10-2019, 08:04 AM
#10
What? You don't????
It has nothing to do with fuel economy; it has to do with tracking the operating performance of your car(s)....and making sure everything is within specs..
Gasoline is the one thing that your car measurably burns off. Any sudden change in your fuel usage is a good, clear indicator that something is going wrong or has gone wrong with your car. If you depend on your dummy lights for that, you'll usually catch the issue when it's approaching 'critical mass'.
With my '95 Impala (daily driver), I know that I can go about 300 miles of normal driving and it'll take between 18 to 18.5 gallons of gas. If I'm at 'E' in less than 300 miles, I know something's up that requires attention.
I also check my oil and coolant levels from time-to-time....as well as the water usage in my house, my blood pressure, etc......
In the Army, we call it; "Preventive Maintenance, Checks and Services" (PMCS). Anything that gets used.....should be regularly checked for performance changes and early on-set of malfunctions.
Jus' sayin'....
KW
Gasoline is the one thing that your car measurably burns off. Any sudden change in your fuel usage is a good, clear indicator that something is going wrong or has gone wrong with your car. If you depend on your dummy lights for that, you'll usually catch the issue when it's approaching 'critical mass'.
With my '95 Impala (daily driver), I know that I can go about 300 miles of normal driving and it'll take between 18 to 18.5 gallons of gas. If I'm at 'E' in less than 300 miles, I know something's up that requires attention.
I also check my oil and coolant levels from time-to-time....as well as the water usage in my house, my blood pressure, etc......
In the Army, we call it; "Preventive Maintenance, Checks and Services" (PMCS). Anything that gets used.....should be regularly checked for performance changes and early on-set of malfunctions.
Jus' sayin'....
KW
05-10-2019, 08:12 AM
#11
If the gear change is 'modest', and the car is driven in all normal traffic conditions, you shouldn't notice much difference one way or the other.
KW
05-10-2019, 09:09 AM
#12
My 383 LT1 in my 96 (T56/4:10) and my 327 in my 67 (TH350/3:73) both get 15 mpg ish combined city/hwy...….YMMV
agree that monitoring MPG is part of "maintaining" the car....just like gauges and the other fluids
agree that monitoring MPG is part of "maintaining" the car....just like gauges and the other fluids
05-10-2019, 09:54 AM
#13
What? You don't????
It has nothing to do with fuel economy; it has to do with tracking the operating performance of your car(s)....and making sure everything is within specs..
Gasoline is the one thing that your car measurably burns off. Any sudden change in your fuel usage is a good, clear indicator that something is going wrong or has gone wrong with your car. If you depend on your dummy lights for that, you'll usually catch the issue when it's approaching 'critical mass'.
With my '95 Impala (daily driver), I know that I can go about 300 miles of normal driving and it'll take between 18 to 18.5 gallons of gas. If I'm at 'E' in less than 300 miles, I know something's up that requires attention.
I also check my oil and coolant levels from time-to-time....as well as the water usage in my house, my blood pressure, etc......
In the Army, we call it; "Preventive Maintenance, Checks and Services" (PMCS). Anything that gets used.....should be regularly checked for performance changes and early on-set of malfunctions.
Jus' sayin'....
KW
It has nothing to do with fuel economy; it has to do with tracking the operating performance of your car(s)....and making sure everything is within specs..
Gasoline is the one thing that your car measurably burns off. Any sudden change in your fuel usage is a good, clear indicator that something is going wrong or has gone wrong with your car. If you depend on your dummy lights for that, you'll usually catch the issue when it's approaching 'critical mass'.
With my '95 Impala (daily driver), I know that I can go about 300 miles of normal driving and it'll take between 18 to 18.5 gallons of gas. If I'm at 'E' in less than 300 miles, I know something's up that requires attention.
I also check my oil and coolant levels from time-to-time....as well as the water usage in my house, my blood pressure, etc......
In the Army, we call it; "Preventive Maintenance, Checks and Services" (PMCS). Anything that gets used.....should be regularly checked for performance changes and early on-set of malfunctions.
Jus' sayin'....
KW
Part of me wants to see what it would do on a full tank and staying in vac but, where is the fun with that?
05-10-2019, 08:24 PM
#15
On The Tree
so you run a special program that calculates the avg mpg weighed against your driving habits to the day/week and compare the data to what its supposed to be vs. its actual, every time?
05-11-2019, 09:33 AM
#16
05-13-2019, 08:41 PM
#17
I've always gained city mileage going with gears.
BTW.....
POSITIVELY effected means effected in a positive manner (better mileage)
NEGATIVELY effected means effected in a negative manner (worse mileage)
In case you were just confused by the use positive ( + ) v. negative ( - )
KW
Last edited by KW Baraka; 05-13-2019 at 08:57 PM.
05-14-2019, 09:11 AM
#19
Village Troll 
iTrader: (2)
Anyway, the time that I had 3.73's and went to 4.56's with the solid cam engine I never did a road trip. Everything was very short highway jaunts mixed with stop/go. I never noticed any change. When doing the math it always equated with 17mpg when filling up. With my HR cam I've done a 4 hour road trip with straight freeway at 80mph with the 4.56's and was pleasantly surprised with the 20mpg. I can understand what you mean regarding taller gears, more leverage, easier to move the load/less energy required to move that load, etc, and agree with you on that. For some reason I thought you were saying freeway mileage would be affected in a bad way.
05-15-2019, 09:17 PM
#20
Words and reading are hard sometimes, however you need "affect" in your sentence if you're going to use it as a verb.
Anyway, the time that I had 3.73's and went to 4.56's with the solid cam engine I never did a road trip. Everything was very short highway jaunts mixed with stop/go. I never noticed any change. When doing the math it always equated with 17mpg when filling up. With my HR cam I've done a 4 hour road trip with straight freeway at 80mph with the 4.56's and was pleasantly surprised with the 20mpg. I can understand what you mean regarding taller gears, more leverage, easier to move the load/less energy required to move that load, etc, and agree with you on that. For some reason I thought you were saying freeway mileage would be affected in a bad way.
Anyway, the time that I had 3.73's and went to 4.56's with the solid cam engine I never did a road trip. Everything was very short highway jaunts mixed with stop/go. I never noticed any change. When doing the math it always equated with 17mpg when filling up. With my HR cam I've done a 4 hour road trip with straight freeway at 80mph with the 4.56's and was pleasantly surprised with the 20mpg. I can understand what you mean regarding taller gears, more leverage, easier to move the load/less energy required to move that load, etc, and agree with you on that. For some reason I thought you were saying freeway mileage would be affected in a bad way.
KW