What Octane do you use?

[powerslave1966]

I run the mid grade,it's only like .10cents more then regular.. I'm getting 240miles to a tank with about 3 gal.left in the tank.. I noticed with the midgrade it seems to run smoother too ..Regular made it feel more "draggy"..

Not bad for a hemi... I like to fuel up with premium and dump a bottle of seafoam when we go on trips.....for some reason I was under the impression that the XK's had a 5 gallon "Reserve" ....