Why not just get a refillable tank? I have one, and it's great for airing up the mower tires out in the shed, and whatnot. I use my "big" compressor to refill it (or just run to the gas station and put it on their dime).

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)