Last fill up for me was 1.8 gallons @ $7.54 (runs better with premium). Went 132.4 miles on the 1.8 gallons of which maybe 25 miles was on the highway as I'm still trying to keep the carbs from fouling the plugs at 60-65mph. That comes out to a cool 73mpg. That's down a bit from the last tank but still quite respectable I'd say.
Oh and the 175 isn't nearly as comfortable as my SVX but is on par with the F-250 and aside from my feet vibrating asleep after 20 minutes is close to the Nighthawk with the corbin which I'm lucky if I see 40mpg out of. Needless to say the Nighthawk tends to sit quite a bit. Total investment of $800 including a title (had to use a service), tags, insurance, new shoes total ground up home resto including new rings and gaskets. Once you've tired of your smoker she can be yours for $1900.