Thanks All.
I plan on filling up right before I cross. I'll be taking the Detriot bridge when I cross, since there are more frequent stops that if I were to go through Sarnia.
Haven't really had the SHO on the road much for long trips, so still unsure what kind of MPG's I will get. I hope it is higher than 25. I'll be ok with that.
Gas prices here are starting to creep up as well. We are at $4 a gallon for 93+ at Shell.
I will download that Petro Canada app before I leave.