Semi Truck Fuel Injection Throttle Body Spacers

I have it hooked up to a performance throttle body. I'm sure it gives me a few more ponies... Still testing

I'm amazed, after reading a bunch of reviews it was a surprise to find out how easy the install was and that I actually gained mileage per gallon even though this is just a throttle body spacer on average, I was getting 28 miles to the gallon on a good day, now it seems like on average I get 30 sometimes 31 if I stay out of it.