the last I witnessed a 40mpg truck was little chevy luv carbed, mastered. Like cars in the same standard, exhaust had to be changed, egr gadgets, etc.
there is the rabbit, but transverse unibody with the top cutoff hardly carried a gallon of milk.
that may be another last of reality vehicle...like an old sube with dual range. The fule injection argument for efficient is a hoax, no modern truck, actually a TRUCK is going to get anywhere close to it. it needs super stoich metered for the engine wthout an ECU. The last frustration to mention, is trucks ride rough, a bump changes a squirt of fuel into the slob of injections reality, carbs didn't. I grew up through this stage of changes in autos, it is a buried story I like to repeat often.
