Efficient driving — Vermont Permit Test
Efficient driving on the Vermont permit test — 4 rules, each with the reason behind it and a question on it while it is fresh.
The rules
On the Interstate, driving at 55 or 60 miles per hour instead of 65 saves fuel. The EPA estimates up to a 15 percent improvement in fuel economy from this alone.
Air resistance grows sharply with speed, so the last few miles an hour cost the most fuel.
On the interstate, drive 55 or 60 miles per hour instead of 65 to save fuel. EPA estimates up to a 15 percent improvement in fuel economy by following this tip alone.
Limit stationary warm ups to 30 seconds where you can. Parked in town, idling for more than 10 seconds uses more fuel than shutting the engine off and restarting it.
A modern engine warms up faster being driven gently than it does sitting still.
If you're parked in town, idling for more than 10 seconds uses more fuel than shutting off and restarting.
Letting a vehicle idle unattended in public breaks Vermont's unattended motor vehicle law. If you leave your vehicle, you must shut it off.
An idling car with nobody in it is a car anybody can drive away.
Allowing a vehicle to idle while unattended in public is in violation of Vermont's unattended motor vehicle law; if you leave your vehicle, you must shut it off.
Do not drive with the windows open unless you keep your speed under 50 mph. Open windows at highway speed add drag and lower fuel economy.
At highway speed an open window costs more fuel than the air conditioning it was meant to replace.
Don't drive with the windows open unless your keep your speed under 50 mph.
On the test
What does dropping from 65 to 55 on the Interstate save?
Up to 15 percent in fuel economy. Air resistance grows sharply with speed, so the last few miles an hour cost the most fuel. 2025 Vermont Driver's Manual, p.68: “On the interstate, drive 55 or 60 miles per hour instead of 65 to save fuel. EPA estimates up to a 15 percent improvement in fuel economy by following this tip alone.”
How this works
Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.
You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.
Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.
What it costs
- One payment, once — not a subscription. Nothing renews and there is nothing to cancel, for an exam you sit one time.
- Free to start: a 10-question test and the first section of cards. No sign-up and no account.
- Paying opens the rest of the cards, unlimited full-length practice tests, and retests built from exactly the questions you got wrong.
- Every level up to Prepared — 3 tests passed in a row.
- Do the work, fail the real exam, and we refund you.
Where these come from
Every rule here is checked against 2025 Vermont Driver's Manual, published by the Vermont Department of Motor Vehicles, and against the state code itself. Last checked 2026-09-15.
- src/assets/drivers-manuals/VT.pdf (2025 Vermont Driver's Manual, form VN-007, retrieved 2026-09-14)
- src/assets/drivers-manuals/VT.pages.txt (pdftotext -layout over that PDF; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/SOURCES.json (sha256, folio offset 1, folioMarker, nonLawPages, signGalleryPages and the extraction flag, each with its basis)