Tracking fuel and mileage costs on the CLK430

Off and on I have been tracking the fuel consumption and milage on the CLK430. Almost all of thise is commute driving.

1999 Mercedes-Benz CLK430

1999 CLK430
1999 CLK430
Date Gallons Odometer Start Total Miles Mileage
8-Dec-2009 13.9 118132 333 23.9 MPG
12-Dec-2009 14.9 118494 362 24.3 MPG (best to date)
2-Feb-2010 15.0 119469 347 23.1 MPG
18-Feb-2010 12.8 119850 291 22.7 MPG (worst to date)
22-Feb-2010 13.6 120180 319 23.45 MPG

I plan to keep track of this, as often as I remember to note it, that is. It looks like my mileage has dropped a measurable amount in the last few months. Some of it could be fuel mixes for winter, but I suspect the car needs a tuneup, since It’s been well over a year since I even checked plugs. I believe they are the originals!

There are 16 multi-tip Platinum plugs in the motor (2 per cylinder) and they cost about $10 each. I’m not really clamoring to spend $160 on plugs plus the labor (I can’t get to 12 of them easily) to have them done. But.. it seems like I should do it now before I start to have mechanical problems.

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