I Am Lookin For An Estamate For My Dic . For My Average Mile Per Gallon It Says 10.4 . I Have 38.5 Tires . So How Do You Calculate That Without Hand Calculating Every Tank . My Speedo Is Right On With The Attitiude Display . I Am Thinking 10.4 Will Actually Be 13.4 Or 14.4 . Anyone ?

why not just calculate it by hand one tank, and get your estimate there?

If you want to get a decent reading from the DIC you still have to do some math.

Figure out how far out, percentage wise, your are with spead and then multiply what the DIC says by that.

For instance speedo says 60, attitude says 70, well your spead is off by roughly 15%, so then what you do is multiple what ever your DIC says by 1.15(or 115%). It aint perfect, but its close.