what gas mileage do you think I'll get - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ackattack · 05-01-2011, 11:34 AM

I'm seriously considering putting on a factory TBI system onto my 69 to help with gas mileage.

Currently it has a 600 cfm edelbrock.

It has 3.08 gears and a 4 speed. I'll be getting new tires sometime soon (probably go with 275/60/15) Right now it has 285/70/15 BFG radials t/a (they don't make that size anymore).

So take your guesses. I'm hoping for 18 on the highway, but we'll see.

I may buy a donor truck (88-93ish) with a 5 speed manual. With the 3.08s I think 5th gear would be 70+ anyways. With the current tires on it, 50 was at ~1500rpms.

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05-01-2011, 11:34 AM	#1
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	what gas mileage do you think I'll get I'm seriously considering putting on a factory TBI system onto my 69 to help with gas mileage. Currently it has a 600 cfm edelbrock. It has 3.08 gears and a 4 speed. I'll be getting new tires sometime soon (probably go with 275/60/15) Right now it has 285/70/15 BFG radials t/a (they don't make that size anymore). So take your guesses. I'm hoping for 18 on the highway, but we'll see. I may buy a donor truck (88-93ish) with a 5 speed manual. With the 3.08s I think 5th gear would be 70+ anyways. With the current tires on it, 50 was at ~1500rpms. . __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index



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