As the engine was running so nicely, I had originally been intending to leave the spark plugs, but after finding that the air filter apparently hadn't been replaced for a long time, I thought I should do the plugs. It's not exactly like they are expensive.
True to form, it all took a bit of getting apart, but not as bad as the air filter. Why are modern engines so difficult to get into?
So, the good news was that the plugs were a fairly nice colour. The bad news (or good, depending on your viewpoint) was that the gaps were enormous! Definitely glad I'm changing them. And I gave the threads a good coating of anti-seize :-)
On my first tankful of fuel after replacing the air filter and spark plugs, I was pleased to see that the MPG had gone from 30 to 32. I'm pretty happy with that, considering I'm essentially pushing a big square box, with the aerodynamics of a brick, along!
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