Project "Sparkles"-1997 LX450 Gen V 6.2 Swap (1 Viewer)

[Xylonmedia]

Curious about this as well. Im thinking about picking up an 80 to do an LT swap with 37's. The two things I dislike most about my 100 are the power and gas mileage. If I could get the same or better MPG on larger tires with more power it would be a dream come true.

I’m not OP and I’m sure he’ll have real world data. That said, My LT swap is just a pile of parts in my garage… and I’m in it more than $15k… I could buy a lot of fuel for what I’ve thrown at this project.

I wouldn’t make MPG improvement your guiding star. Even in an Escalade 4x4 with a stock tune and displacement on demand; the L86 was rated for 14 city and 23 highway. Add weight, 4.11’s, full time 4x4 plus the aerodynamics of a cobblestone and big tires, it can’t be great.

 

[ScotyDosentKnow]

I’m not OP and I’m sure he’ll have real world data. That said, My LT swap is just a pile of parts in my garage… and I’m in it more than $15k… I could buy a lot of fuel for what I’ve thrown at this project.

I wouldn’t make MPG improvement your guiding star. Even in an Escalade 4x4 with a stock tune and displacement on demand; the L86 was rated for 14 city and 23 highway. Add weight, 4.11’s, full time 4x4 plus the aerodynamics of a cobblestone and big tires, it can’t be great.

MPG is definitely not the #1 thing I'm after, I own 3 other vehicles that get much better. I just didnt want to get rid of the 100 for an LT swapped 80 that gets 6mpg or some thing ridiculous. Also an Escalade has a curb weight that is roughly 1,000lbs more than an 80 Series. I would be happy if I could get mid teens on 37's. We do a lot of big trips and I'll take any range I can get.