I had a 30mpg 1-ton Ram 3500 that I did an article on like 7 years ago, the grille block and electric fans were worth 2-3mpg in almost all conditions..... works great on diesels since the front is basically a big parachute!
1997 Dodge Ram 3500 Dualie Cummins - Diesel Power Magazine
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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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