Don't need to keep it under 60, don't need to do 1000 miles straight. I have done it 6 times this summer. Trips are 200 miles at a time, 2/3 highway (495/95), 1/3 rt1 in Maine. About 100 miles per tank are local around the town miles. I can't do it if air temps are below 68dF. It is much easier to do if one has a 6mt like I do rather than a DSG.1000 is doable if you can keep it under 60 MPH on the highway for 1000 miles straight. That's hard to do for a lot of people.
WOW, I see that you have added 19.25 Gallons at one fill, this is the most that I recall anyone stuffing in an NMS.I've done several 900+ tanks and finally did a 1006 last week. Put 19.054 gallons in it at fill up.
Thats greatJust got 921 miles on a tank , MFI reading was 56.4MPG , calculated real mpg was 52.29MPG . Used my car for a everyday commute driving (20 + 20 miles 45-55mph) AC was not used . 17.613 gallon diesel flow to the tank after the mfi warning said : 10 miles left