LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Lt1 gas mileage, worse than ls1 ?

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Old 12-14-2006, 03:55 AM
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Default Lt1 gas mileage, worse than ls1 ?

2 Stock cars. 97z28 M6 and 98 z28M6. Same mpg or is there a difference ?
Old 12-14-2006, 05:02 AM
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What I usually see is the LT1 gets slightly worse average mileage.

I think the reason is that the LT1 is easier to "play" with, due to the lower torque curve.
Old 12-14-2006, 12:11 PM
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the lt1 will get worse mileage. It's because of how the fuel systems are setup. the ls1 is Sequential injection which fires the injectors one at a time, the lt1 is Multiport fuel injection which pulses the entire bank of 4 cylinders at a time. I do also agree that lt1s are fun for cruising cuz their torque comes in alot lower.
Old 12-14-2006, 12:56 PM
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it was my understanding that 93's are bank/bank, 94+ is sequential. i may be wrong though.
Old 12-14-2006, 01:00 PM
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Originally Posted by PunkerPontiac
Multiport fuel injection which pulses the entire bank of 4 cylinders at a time.

Isn't this the definition of "Batch-fire Injection?"
Old 12-14-2006, 01:17 PM
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I always thought 94+ were sequential.
Old 12-14-2006, 02:03 PM
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94 and up cars are indeed sequential fuel injection and yes the ls1 cars do get slightly better milage but not by much i have seen 28-29 mpg at most with my car usually im sitting at about 27 mpg witht the cruise set at 80

im sure if i ever did go on a long trip going slower like around 70 or so i could see closer to 29-30 mpg
Old 12-14-2006, 02:23 PM
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LT1 with the 2.73 gears was getting awesome milage, about 28 on highway 20 in town. My LS1 gets about 17/24.
Old 12-14-2006, 03:32 PM
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Originally Posted by PunkerPontiac
the lt1 will get worse mileage. It's because of how the fuel systems are setup. the ls1 is Sequential injection which fires the injectors one at a time, the lt1 is Multiport fuel injection which pulses the entire bank of 4 cylinders at a time. I do also agree that lt1s are fun for cruising cuz their torque comes in alot lower.
before posting.
Better yet, the Ultimate Lt1 Newbie Faq sticky is a good place to look for this kind of information too.

Intake and Fuel Delivery
Fuel Delivery: Electronic Fuel Injection, sequential port
Injector Size: (17124248) 3.0gps, 22lbs/hr speed density (1992-1993), 24lbs/hr mass airflow (1994-1997)
Throttle Body: 48 millimeter twin butterfly
Intake Manifold: (12552137) Aluminum
Old 12-14-2006, 04:14 PM
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pfftt ls1s? please...I get 86 mpg in my lt1
Old 12-14-2006, 05:03 PM
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Originally Posted by BRETTINATOR
pfftt ls1s? please...I get 86 mpg in my lt1
86 mpg HAHAHAHA
Old 12-14-2006, 05:26 PM
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with my mods i get 22 mpg.
Old 12-15-2006, 09:21 AM
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think I'm getting like 10mpg...I honestly don't know, but it's not a pretty picture, she' likes ONLY high octane...she LOVES race fuel...$$$$$$ so it's a treat to get to drive her around, just expensive...price you pay for ridiculous setups I guess
Old 12-15-2006, 07:13 PM
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since I put my headers and cutouts I have been getting around 22mpg too



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