2006
[nonono] 3:73 gears picked up only .85 mpg ( just thought Id pass this along)

I have the race box and have had it on the low(60) setting for 3 weeks, the MPg is the same. I filled friday and switched to the 100 HP setting and wil see if I get any better mileage.

how many miles on the truck?

4500 miles

Don't look for mileage out of your truck in any form till after at least 20,000 maybe 25,000 if it doesn't get worked hard.

That seems reasonable. They say “up to” a 3mpg increase.

Here’s how I see it. I get 15mpg now, and for the sake of this discussion, I get 16mpg with the XZT. When I fill up I average 30 gallons at $3 a gallon. At 15mpg, my fuel cost per miles is 20 cents. It goes down to 18.75 cents per mile at 16mpg. I drive 50,000 miles a year (that is true).

At 15mpg, my fuel costs average $10,000
At 16mpg, my fuel costs average $9375

You will have paid for the XZT in about 24k miles. Your truck has relatively few miles on it as well, so mileage should increase somewhat over time as well.

What mileage were you getting before the XZT and which truck configuration do you have (signature)?

I installed one on a friends 06 a few weeks back. I would post the increase we seen on a highway mileage test but there are too many skeptics and nonbeleavers (IE hecklers) so I'll just say he got alot more than your posting.

city driving seems to be around the increase your posting.

Don't look for mileage out of your truck in any form till after at least 20,000 maybe 25,000 if it doesn't get worked hard.

exactly what i was gonna say.

I love my mileage, 20-24+ depending. Guess I got a "good" one. :)

I gain almost 2 MPG hand calculate with winter fuel I am at 19 MPG right now and temperature getting warmer I seing a big difference I did it 20 MPG last week , Can t wait to see with summer fuel . Truck at 23000 KM now and getting better.

Buzzman

I was getting 17.15

Was getting 17-17.5 mpg with my XZT until I switched to synthetic oil. The last 3 tanks since the synthetic oil has been 18.3, 18.9 and 19.0 mpg. I hand calculate every tank. I have 32k miles.

My around town went up by 1 to 1.5 around 16 to 17 mpg on the freeway ive gotten 24 mpg doing 60 to 65 mph, this is all on paper as my overhead seems to good for only temperature. This is all on winter fuel up North.

at 4500 miles your not going to see real mpg numbers break it in then let us know.