1999 GMC Suburban K2500 DD - The 1947 - Present Chevrolet & GMC Truck Message Board Network

07-03-2020, 08:25 AM

#17

OutlawDrifter

Registered User

Join Date: Aug 2012

Location: Northeast KS

Posts: 1,775

Re: 1999 GMC Suburban K2500 DD

Quote:

Originally Posted by LT7A

Very clean truck and I like you updates you made. That rig should serve you well and in comfort too. I would also be curious about your highway mileage when you get the chance to calculate it. Thanks.

Thanks!

Last tank back and forth to work was 11.2mpg. This is with the Blackbear tuned ECU. Definitely drives much better

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1999 GMC Suburban K2500 SLT, 454/4L80E
1991 Z/28, 6.0L/T56
1949 GMC 250, S10 Frame, 6.0L/4L80E

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