MMO and Fuel Mileage
I have used MMO (Marvel Mystery Oil) for the last few years but never actually measured and just poured a little in my tank, filled and drove. The last four tanks I measured and wrote down my results.
4th tank ago I used a commercial cetaine boost and lubricant. 14.3 MPG recommend amount.
3rd tank ago same product, doubled amount. 14.5 MPG
2nd tank ago MMO 2 oz per 10 gal. 15.3 MPG
Last tank 4 oz per 10 gal. 15.78 MPG
After that fill which I used 4 oz per 10 gal again the idle is higher. I don't know how that works but I am going to have to turn it down.
All the driving is city block to block lights, some blvds but no freeway. A daily commute of 10 miles each way and the wife driving. The fuel station is 2 miles away and pumps more diesel than any other station in the area and it is always fresh. Same pump each fill.
83 GMC Jimmy 4X4
Diesel Depot 6.2L in 8/2004
Balanced, Ceramic pistons and longer duration cam
6.5L HumVee Artic Pump
K&N Air Filter, Racor 2 micron secondary, Dual MagnaFlow 2 1/2" Stainless 6" Round and sounding GRRRRRREAT!!
Rusty cab under new paint
366,666 miles overall...9/11/11