If I were to get a tuner, it would be the SC. I'm planning on staying 'stock/mostly stock', so SC would be the preferred choice.
My experience with bikes and tuners is somewhat relative,,, both my bike (VTX) and the Hemi use a Speed Density FI system,,,, In the bike, we just dial in new fuel tables with lower A/F ratio's, Great for power, not so great for mileage!
The Hemi is obviously quite a bit more complex than the bike!!!!
I can see where the most gains in MPG would be acheived by driving habit. I'm pretty durn "slow and EZ" now,,, but a little more low end TQ would be nice,,,
I'm curious how the MDS would respond with an SC 87 tune,,,. (I like MDS, unlike perhaps a lot of folks who purchase tuners)
My 'most common' trip is to work and back,,, About 12 miles one way on 35-45 mph sidestreets,,, flat as a pancake,,, PERFECT 'MDS type' driving,,,