Somehow I managed to get 51.5 mpg from the Sonoma (remember, that's with UK gallons, not the smaller US gallon). Mostly highway miles, little town driving. I keep the speed down to around 55mph. Best by far I have ever gotten. Usually around 40mpg. Still, not bad for a small truck.
I adjusted the pump some a couple of weeks ago and it's been better on fuel ever since.
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1991 GMC Sonoma Ext Cab w/Isuzu diesel (converted March Mar 2003) - sold
1994 S10 Ext Cab w/Isuzu diesel (converted Mar 2008)
1998 Toyota Sienna XLE
B6100HST Kubota CUT DIESEL
1994 S10 with Isuzu diesel and 5spd
http://img.photobucket.com/albums/v6...S15/SigPic.jpg