1999 GMC Suburban K2500 DD

[LT7A]

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?

[OutlawDrifter]

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?

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.