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Which chart, the one in my signature with my MPG stats?
I personally wash my engine bay now and then. If you're going to do it, it's probably a good idea to put a plastic bag over your alternator and air intake, but so long as you don't take a very high power pressure washer to it, washing should be alright.
I can think of a few other possibilities on why Teal might not have as much power. Dirty injectors, clogged EGR or PCV valve, not sure D series engines had EGR valves? Possibly some crud buildup in the intake manifold. Does it burn any oil?
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