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Re: 1999 GMC Suburban K2500 DD
Quote:
Originally Posted by LT7A
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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The throttle is more responsive, crisper/firmer shifts, power when you need it. I would say 13mpg tops on the highway. It's heavy and has 4.10 gears. But I also managed 10.5mpg towing a 12' enclosed tandem axle trailer at 71mph almost 180 miles 1 way. That impressed me.
At $2.50/gallon for fuel, it still costs me $1k less/year to drive an average of 15k miles over my 2017 F150. Tags/taxes and insurance are just sooo much cheaper.
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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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