No idea honestly. I haven't bothered to look. I could care less about mpg's - I drive the truck and have to fuel up either way so I just stop when I need to.
Finally got the 40% portion of my rear seat delete in from Goose Gear. Honestly 6/10 product. If i had to do it again, I would just make my own. They have a great product but I do have a couple of complaints.
1. Their instructions are as good as hotdog water.
2. For a premium product like this, I'd expect it to show up in pristine condition. Pictured below is slight damage to the product. Doesn't make it any less functional, but is is annoying that it came like that.
3. I feel like they waste so much space in the cab keeping the delete so high off of section underneath it. I understand there's a battery and other components down there but if the seats are on, there is far less room above the battery and it's sealed the same - if not tighter.
I will probably go on to modify it and bring the top plate down some in the future. That's a project for another day though.