Thank you for keeping an open mind. There are many people that admittedly do not have an open mind about this.
I actually have an open mind too, except when people proclaim with absolute certainty that he is the killer.
There are five reasons that I do not believe he is the killer.
1. He doesn't demonstrate a level of desperation to be out of the relationship that would require him to kill.Really? How much do you need? He was with his girlfriend on his anniversary. He was whining and manipulating his SIL and on the verge of his MIL moving in! Also verbally complaining to friends about his sex life. He even complained to acquaintances.
2. The evidence that suggests he is the killer is extremely weak and full of "could have's". And most of that evidence seems to be ways to justify that he could have done it in the face of evidence that he didn't. Totally disagree.
3. The gas mileage. It doesn't add up. (This, to me, is the number one piece of exculpatory evidence) It did in my book.
4. There was too much "normal" interaction between Jason and the people in his life (wife, mother, girlfriend, etc) the two days surrounding the killing. Are you kidding me? All those phone calls to his mother were normal? But he wouldn't take his MIL's call.
5. There are too many places where, had he done it, the whole thing could have gone wrong. Someone once said he was the luckiest guy. If he did do it, I agree that he is the luckiest guy in the world because there are so many opportunities for the whole thing to go awry, yet he is never caught once by anything that would be undisputed such as a camera. That is just too many coincidences that, combined with the exculpatory evidence, justify a conclusion of innocence.