Originally Posted By: azsynthetic
I just got done running 1,500 miles with 8oz of Z-Max in the fuel and 8oz in the oil. So far I got almost 2 extra miles per gallon. Engine is 03 VW 1.9L TDI, mileage went from 57 to 59mpg on D2. Don't know how long this will last but so far so good.
I have No Idea of what kind of Fuel you have in AZ, but could it be your mileage vent up as they switched from "Winter" to "Summer" gas?
My wife's Cherokee 4.0 XJ has had Z-Max in it for around 2k now, with PP and it has improved mileage by a bit, like yours, But im not sure if that is because of the warmer weather and "Summer" gas.....
Tho I do have to admit, It has the best Mileage now that it ever had, and we had it for over 150k now......