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Should I get a tune up at 105,000 miles? Is it necessary? I'm at 104,000 and I'm getting better mileage now than ever. Today I got 110.4 MPG on a 17 mile stretch where my previous high was 105.9. Been getting 80 MPG, or just under 80 going to work. If it's not necessary to get a tune up now, what conditions should I look for that will tell me it's time?
 

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The main thing you should do is get new spark plugs. If you hear the valves tapping, then you could get those adjusted (but since your getting great mileage, you probably are ok).

Remember the plugs are coded to a specific cylinder (A,B,C,D) and the only way to know what they are is to remove the stuff on top of the plug (a couple screws). If you have Honda do it, make sure they don't just put whatever plugs into whatever cylinders. I'd suspect they'd have to have the car in and take a look at which plugs are needed, order them, and have you back in later to do the install. I'd find it hard to believe a Honda dealer would have a stock of Insight plugs in every code.
 

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I changed the original plugs at 93,000 miles, a few days before a 2200 mile road trip to Florida. They were in very good condition. I would not have been afraid to leave them in but I already had bought the new (B) plugs.
I did keep them for spares (or collectors items).
I adjusted the valves at 102,000. I tightened two of the intake tappets .001 to .002 and one exhaust tappet the same. The rest were in spec.
The previous owner had the valve adjustment done at the 60,000 mile service.
I serviced the K&N air filter at the same time. I had been wanting to check the valve adjustment since I have read a lot of debates here and elsewhere on the filtration of the K & N. I am now satisfied that it does a very good job of filtering harmful media from the intake air. If a lot of contaminates had been passing through, the intake valves would have been TIGHT. The dirt wears the valve seat and face. I have seen this a lot in motorcycles. I worked in a Honda motorcycle dealership service department four years mainly on dirt bikes.
 
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