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gchemist · 05-29-2008, 04:02 AM

I can report milage at 80 MPH. I took a round trip to El Paso. 1200+ miles. At 80 MPH, the Jimmy pulled 20.5 miles per gallon. Wow!! I wonder what it will do at 70! A little slower and it goes up. I 'm running 255/60R17 (29") tires. The 4.3 had no problem turning the large tires. The extra power and fuel map sure does help.

Now, I'll be running in the city. As soon as I can go through a full city tank, I'll post milage.

05-29-2008, 04:02 AM	#5
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: Update your PCM!! I can report milage at 80 MPH. I took a round trip to El Paso. 1200+ miles. At 80 MPH, the Jimmy pulled 20.5 miles per gallon. Wow!! I wonder what it will do at 70! A little slower and it goes up. I 'm running 255/60R17 (29") tires. The 4.3 had no problem turning the large tires. The extra power and fuel map sure does help. Now, I'll be running in the city. As soon as I can go through a full city tank, I'll post milage. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos