Gas Mileage TBI --> TPI
Member
Joined: May 2004
Posts: 169
Likes: 1
From: Lyndonville, VT
Car: 89 Firebird Formula
Engine: Custom Forged 402ci LS2 w/STS Turbo
Transmission: T56 6-speed
Axle/Gears: Moser 9" with 4.11
Well, there you have it. With an A4, I was getting 16mpg local and 20 on a trip with my TPI. Haven't heard of M6 cars getting much over 23 with TPI, so TBI may actually be more efficient mileage wise by the sounds of it.
Joined: Feb 2001
Posts: 13,776
Likes: 567
From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Originally posted by 89FormulaLS1
Well, there you have it. With an A4, I was getting 16mpg local and 20 on a trip with my TPI. Haven't heard of M6 cars getting much over 23 with TPI, so TBI may actually be more efficient mileage wise by the sounds of it.
Well, there you have it. With an A4, I was getting 16mpg local and 20 on a trip with my TPI. Haven't heard of M6 cars getting much over 23 with TPI, so TBI may actually be more efficient mileage wise by the sounds of it.
Supreme Member
Joined: Jun 2002
Posts: 1,571
Likes: 0
From: ATX
Car: Kitt
Engine: Classified
Transmission: T56
Axle/Gears: Moser/4:11
Originally posted by 89FormulaLS1
Well, there you have it. With an A4, I was getting 16mpg local and 20 on a trip with my TPI. Haven't heard of M6 cars getting much over 23 with TPI, so TBI may actually be more efficient mileage wise by the sounds of it.
Well, there you have it. With an A4, I was getting 16mpg local and 20 on a trip with my TPI. Haven't heard of M6 cars getting much over 23 with TPI, so TBI may actually be more efficient mileage wise by the sounds of it.
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Joined: Feb 2001
Posts: 13,776
Likes: 567
From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Originally posted by tamatt27
I got 28 in my L03......Not the LT1....the damn thing isn't even running yet!
I got 28 in my L03......Not the LT1....the damn thing isn't even running yet!
Supreme Member
Joined: Aug 2001
Posts: 1,770
Likes: 1
From: Pacific Northwest
Car: '85 IROC
Engine: LB9
Transmission: 700 R4
Originally posted by ShiftyCapone
I doubt it as well. I got 32mpg on the highway all the time when my 305 TBI was bone stock.
I doubt it as well. I got 32mpg on the highway all the time when my 305 TBI was bone stock.
Is this TBI motor equipped with the swirl port heads?
Could it be possible that those heads actually have something going for them in terms of fuel efficiency? Cause it's hard to imagine that a TBI would be more efficient than a TPI with multipoint EFI, everything else being equal. If you know what I mean...
Senior Member
Joined: Mar 2001
Posts: 841
Likes: 3
From: Silverhill,Al
Car: 92 Camaro RS
Engine: 305 TBI
Transmission: T-5
That's one thing swirl-port heads do well is mix up the fuel charge and help get good MPG, when my car was new and stock it would avg . about 22 MPG and get 28-32 MPG on long trips, even running 75 mph with the AC going. I remember getting well over 400 miles to a tank on several cross country trips I made. I just didn't have enough power.
Joined: Mar 2000
Posts: 5,711
Likes: 133
From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
I got 29 on the road with my L03 T-5 w/3.08's @ 75 w/AC on.
I got 32 on the road w/TPI on my L03 w/3.27's (yeah, swirl port heads)
I got 32 on the road w/TPI on my L03 w/3.27's (yeah, swirl port heads)
Last edited by Dyno Don; Nov 13, 2004 at 10:18 AM.
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