mid 80's 318 mpg economy numbers...

I'm not hitting 80mph on a daily basis, just very occassional.
Average highway speed is around 70.

I went to the Mopar Nats in Germany 2 weeks ago which was some 350 pure 'highway'-miles roundtrip and still only netted 13.3mpg.
I did drive a bit faster then usual evenso but expected/hoped for better.

Fun fact is that when I had just bought the car, I made a 300mile roundtrip and got 17mpg.
Few things were at hand though; first the radiator was clogged inside and I could really only drive 60mph. At 65mph the engine started overheating.
Also, the engine had a lousy tune, running very lean on the highway, and it still had its 904 transmission and tiny 7-1/4" rear axle. All mostlikely having less friction losses than the current A518 and larger 8-3/4" axle.