Why does the GX550 get worse MPG than the LX600?

Buck

New member
Mar 4, 2024
8
8
Montana
The GX550 is rated at 15/21/17 MPG, with 349 HP. The LX600 is rated at 17/22/19 MPG, 409 HP. Both have the same 479 tq and 10 speed transmission. I suspect the LX is slightly heavier and enjoys the extra 60 HP. Thoughts?
 
Gearing, off road tuning of engine, ground clearance can be a big one, GX might be less aerodynamic. Buts it’s a massive game or calculus with dozens of inputs that are difficult to resolve to one silver bullet.

Highway numbers are a rounding error away, so my bet is more on the low speed gearing and tires being more optimized for off road that is dragging things down.

It’s not some conspiracy, end of the day most of the things the GX is good at are contrary goals to good mileage.

I’m personally quite happy they focused on those attributes rather than the cynical game of designing cars to game magic EPA ratings that detract from the experience.
 
Gearing, off road tuning of engine, ground clearance can be a big one, GX might be less aerodynamic. Buts it’s a massive game or calculus with dozens of inputs that are difficult to resolve to one silver bullet.

Highway numbers are a rounding error away, so my bet is more on the low speed gearing and tires being more optimized for off road that is dragging things down.

It’s not some conspiracy, end of the day most of the things the GX is good at are contrary goals to good mileage.

I’m personally quite happy they focused on those attributes rather than the cynical game of designing cars to game magic EPA ratings that detract from the experience.
I couldn’t have said it better, it’s always a tug of war between efficiency on road vs capability/comfortability off-road , and the GX is more leaned toward the latter
 
I'm surprised there is not difference between the Overtrail GX and other models. I figured the off-road tires would eat up some fuel mileage.
 

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