Hey MSD, fellow 2000, 4.7 Dakota owner :-). Glad you posted that. It appears the early 4.7 are setup so they "like" E30. Mine has always been an 18 mpg machine on straight gasoline or E10, but for the last year, we have had blender pumps avalible that dispense E30. I was amazed how the MPG in winter is still 18 mpg on E30. I have run it on E70 in summer with only a bit of mpg loss.
The price spread between E0, E10 (same price here has come down more than the price of E30 or E85, they say they are setting on some old expensive E85 stock that they don't want to sell at a loss, so the price spread has closed up some. Last time I filled, E10 and E30 were the same price, so I put in E10 to see if the mpg changed any. Suprise, suprise, 16 mpg, I lost 2 mpg going from E30 to E10 =:-0. I made a 200+ mile trip today and had to refill, so I put E30 back in it. Will be fun to see if my 18 mpg comes back now that the tank is mostly E30.
The sad thing I have noticed is that most flex fuel cars /pickups make less mpg on E10,E20,E30 than non flex fuel rigs. The only explanation that seems to fit is that the FFV rigs have such a conservative fuel map installed in the engine computer to protect the engine from a worst case situation that it kills their economy on e blends. The non FFV rigs may run a bit lean on E 20 or E30, but not enough to turn on a check engine light or cause any problems.
The video link below is really interesting. Really blows away some of the anti Ethanol myths.
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