I was mixing WVO/Diesel earlier in the summer and I think I got somewhere around 17 mostly city driving. As the colder weather is here I have been running straight Diesel. Stop and go city driving netted me almost 21mpg on straight Diesel. I didn't think it was bad for 320,000+ miles.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R