Replaced Serpentine Belt and Tensioner.

209,267 miles.

New serpentine belt and tensioner: Gates K060551 belt ($16.96) and Dayco 89625 tensioner ($112.79), both from Rock Auto. The original belt still looked fine and I didn't see any issues, but after 18 years and 200k miles, Gemini and I figured we should go ahead and replace it. Installation was pretty straightforward.

Replaced Engine Air Filter.

209,267 miles.

I replaced the engine air filter with a Bosch 5154WS that cost $5.43 from Rock Auto! Since it's so cheap maybe I should be changing it more often. The manual specifies the engine air filter to be replaced every 30k miles, and the last time this was done was nearly three years ago at 174,484 miles.

 

31.5 MPG

353.6 mi, 11.240 gal @ $4.399 = 31.5 MPG

209,182 total miles. Shell on Route 4 in Farmington.

30.7 MPG

377.4 mi, 12.280 gal @ $4.219 = 30.7 MPG

208,828 total miles. Shell on Route 6 in Bristol.

31.5 MPG

390 mi, 12.366 gal @ $4.199 = 31.5 MPG

208,450 total miles. Mobil on Farmington Ave.

29.3 MPG

354 mi, 12.098 gal @ $4.199 = 29.3 MPG

208,060 total miles. Mobil on Farmington Ave.

32.4 MPG

337 mi, 10.400 gal @ $4.099 = 32.4 MPG

207,705 total miles. Shell on Farmington Ave.