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The 27 mpg was at 50-55 mph. Those old 12-valvers are pretty thrifty engines, although keep in mind my truck also only weighs 4850 lbs, which is pretty light for a diesel. Injector design also plays a part. Those dynomite diesel injectors are really efficient. When I switched over from those to the ones I have now (which are 300% larger than stock) I dropped about 2-3mpg but gained 100 hp on nitrous....
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1989 Dodge Diesel 972rwhp, 27mpg.
1971 Nova tubbed, solid cam 355 w/nitrous, 8mpg (sorry).
1960 Nash DIY Hybrid Project
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