Relgard guides
Field notes for the driver's seat
Five guides, written from the same sourced facts the product pages stand on — AAA pressure-loss guidance, the FMVSS 138 TPMS rule, U.S. Department of Energy fuel figures, and NHTSA's checking routine. They are arranged as a routine, not a pile: check your pressure, understand what winter does to it, read the dashboard light correctly, choose the right tool, then sort the dog out.
1 · How to check tire pressure
The full routine: find the placard number (not the sidewall number), check cold, read all four tires, top up, and spot the one tire that is losing air faster than the weather explains.
2 · Tire pressure and cold weather
About 1 PSI for every 10°F the temperature falls, plus about 1 PSI a month just sitting still. What an Erie fall-to-winter swing does to a tire, worked out in numbers.
3 · The TPMS light, explained
The dashboard light does not have to warn you until a tire is 25% low — that is the federal rule, not a defect. What to do when it lights, and why a gauge still has a job after it goes out.
4 · Choosing a tire gauge
Digital, pencil, dial, the gas-station air chuck, and the dashboard itself — five ways to learn your pressure, compared on what each one actually tells you and when it tells you.
5 · Dog seat belts: a plain guide
How a harness tether works, the harness-never-collar rule, the state-law patchwork for loose dogs, and an honest statement of what a tether does and does not claim.
Where the guides point
Every guide ends at the product it belongs to: the pressure guides end at the Relgard Tire Pressure Gauge ($19.97, US shipping included), and the dog guide ends at the seat belt as it is actually sold — an add-on described on the catalog page. No guide invents a product, a spec, or a review to get there.