38 sounds good.
I keep a $30 air pump in the car, mine takes like 30 seconds to top up 4-5 psi, can't be arsed to go find pumps/line up/pay, plus if I ever get a slow leak on the road I could at least try to pump it up and try to get to a shop.
@eethan I agree with
@XPsionic on keeping a portable air pump in the car.
There are a zillion to choose from these days (and I'm sure in some cases, there are the same basic pumps being sold under multiple brands).
I have two of these, one in each car (each Tesla!
).
https://www.amazon.com/TEROMAS-Inflator-Compressor-Portable-Inflatables/dp/B07W1W2V9M/
They've worked well for me and I like them because:
1) They work with 12V DC from the car or 120V from the house, so I can use them for things around the house too.
2) Small and light. (So no they don't seem heavy duty, but I don't need heavy duty. If I was buying for my roadside assistance business or something I'd definitely get heavier duty.)
3) Relatively quiet as these things go. (All of these pumps are loud in my experience, but I've had much louder ones.)
4) Includes a digital gauge (only 0.5 PSI increment tho) and automatic stop feature. IMPORTANT: The auto-stop is not super consistent, varies by 0.5 PSI easily, but it's still useful to make sure you don't wildly overinflate if you zone out holding the button. Use a separate more accurate gauge to actually dial in your exact pressures!
5) So far no issues / no failures. The older one I've had for a bunch of years now, the newer one for a year since getting our Model 3.
I have used one of them to inflate a 245/45R19 car tire from fully flat once (obviously got that tire replaced ASAP afterwards), so they are heavy duty enough for that job, at least.
I've also used them to inflate very high volume but low pressure stuff in the house without issue (think giant bicycle tube, but not constrained inside any kind of tire).