What mileage does your slant six powered ride get?

Ddaddy said

That sounds about right. I’ve owned and regularly driven probably a dozen slant 6 cars in my life and never saw much better than around 18 mpg on the highway. Of course, none of those had an OD transmission.

If I could average 17 mpg in mixed driving, I thought it was good enough since I always tuned for power...not mpg.

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The OD isn't really what people think it is. The last gear is not a very responsive gear to the throttle so you end up down shifting a lot. Even on the interstate I find the last gear isn't enough to pass someone. I am always down shifting for more power so it defeats the point of the OD and ends up being more like a standard three speed.

I suppose the OD works better if you kept at a constant 55 but trying to keep it between 78 and 88 mph in a 75 zone requires a lot of downshifting to 1:1 just to keep up with traffic.