Interesting reads. I think that old 128 mpg diesel Spitfire probably performs worse than the other one, though. A stock Spit weighs about 1800 pounds and came with about 60 hp (30 lb/hp) and did 0-60 in about 18 seconds. Putting 17 hp under the hood, even cutting the weight down to 1200 pounds, yields 70 lb/hp... not exactly something that one would expect "acceleration" out of.