Yes. My truck has a lot more power than this build. With larger injectors, cam and an S400 I've seen 20 mpg on the highway. This was on a trip from WV across MD to NJ. I've not checked the local mileage but I do get more days between fill ups.
Thanks John. Couple things I wanted to finish a little better but he got in a hurry. Test drove it to get fuel about a mile down the road and that was it. He jumped in and headed home.
Talked to Grant today. He's back in Baltimore and the truck is doing fine. Said there is a small fuel leak at the injection pump. Not sure If it's the pump or a supply issue. Not to bad for a one mile test drive. He's supposed to get me some pictures to post of it completed.