W211 E280 CS sensor and MPG

[RidleyRumpus]

Recently I had faulty crank shaft sensor such that the car would cut out as you were driving and I had it replaced.

Since then I have noticed an increase in MPG, or am I imagining it. Before I would average in the low 30s going to work etc, but now I find it hard to not get it into the high 30's or even low 40's.

Can this really come from a duff crank shaft sensor?

 

[m80]

We're on summer diesel now.

 

[RidleyRumpus]

We're on summer diesel now.

I've driven it through several summers and it's never given me this MPG.