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



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1999 GMC Suburban K2500 DD

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07-03-2020, 10:22 AM

#18

LT7A

Registered User

Join Date: Oct 2015

Location: PNW

Posts: 3,559

Re: 1999 GMC Suburban K2500 DD

Quote:

Originally Posted by OutlawDrifter

Thanks!

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

Well that sounds all right. You can probably add a couple more MPG to that if you are on the highway for an extended period of time. What kinds of differences did you notice with the blackbear tune?

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