I just traded for an 06 ccsb xlt powerstroke. It has 121k miles. Has been headstudded and egr deleted and had all the updated parts along with an oil cooler at 93k miles. Never owned a diesel so figured id ask a few questions.

1- If i let the truck warm up for 5-10 min and take off do i have to go really easy on it or just as long as i dont wot it?

2- is a tune a must to get decent mileage? Granted ive been taking buddies rides and everything but have only went about 60 miles and used a quarter tank of fuel.

Thanks