Now we know.

Insurance.com recently reviewed coverage options for a hypothetical, 23-year-old Seattle resident named Jeff based on a variety of variables, ranging from his marital status to his driving record. At the start, he's single, owns his own car (an Audi), is carrying coverage levels of 50/100/50 liability with a $500 deductible, and his rate quotes range from $3,206 to $6,198. He wants to save some money, and so starts making lifestyle changes.

Here's what happened to his rate quotes as a result.

He keeps his nose clean

“Accidents, tickets and claims will jack up your rate, in most cases for at least a few years. 'Minor violations will factor into your insurance rate for three years, while major violations can impact your premium for five to 10 years,' says Tom Santamorena with Minto & Wilkie Insurance Agency in San Rafael, California.”

The hypothetical client in this report started out with several recent claims totalling more than $20,000. That contributed to his high rates.

But time heals all wounds.

After a year of safe, accident-free driving, Jeff's rate starts to drop off sharply.

Jeff, 23, with a year-old accident: $2,720 to $4,890

He has a birthday

Starting in a customer's early 20s, most insurers will start lowering rates every year as long as the driver maintains a clean driving record. The magic cutoff is not 25 years, as is often believed.

Here's what that looks like for Jeff, our test subject, assuming he keeps his driving record intact:

Age 23: $2,602 – $4,020

Age 24: $2,590 – $3,474

Age 25: $2,190 – $2,958

Jeff, 25 with a clean record: $2,190 to $2,958

He gets married

This is where the savings start to get real.

According to Insurance.com, data show that married drivers are involved in fewer accidents and are generally lower claims risks all around. The numbers don't lie.

As a result, tying the knot usually comes with a healthy discount on both partners' auto insurance rates, knocking off about 10% off on average.

Jeff, 25 and married: $1,876 to $2,430

He takes public transport

It's simple probability. Fewer miles driven will result in fewer opportunities for accidents.

In this case, Jeff started taking the bus to a new job and, as a result, switched his primary use category from “commuting” to “pleasure use only,” cutting his premiums by about 2% on average.

Jeff, 25, married and taking the bus: $1,876 to $2,430.

He buys a house

Setting down roots is another signal to insurers that a driver is taking more responsibility and will likely be less of a risk behind the wheel. This translates into an average discount of about 1.6% nationally, regardless of whether the driver insures their home with the same carrier as their car.

This is where bundling coverages really pays off. According to Insurance.com, the average savings when homeowners insurance and car insurance are bundled with one company are as high as 8%.

Jeff, 25, married and a homeowner (but not bundling): $1,772 to $2,430

He moves to a small town

“Outside of your own driving record, few things have more impact on car insurance than your ZIP code,” Insurance.com writes. “Less population density typically means fewer accidents.”

Jeff, 25, married homeowner in Pullman, Wash. (not bundling): $1,234 to $2,310

(Editor's note: No, the small town in the photo is not Pullman, Wash. Email me at [email protected] if you think you can identify it.)

He buys a new car

Time to trade in that Audi, Jeff.

By switching out his sporty ride for a more sensible option — in this case, a Toyota Sienna minivan — the client will save big-time on his premiums.

But there's more to these particular savings than just vehicle type.

“The rate has more to do with its claims record than how fast it can go,” writes Insurance.com. “If a lot of younger drivers who have accidents drive the same model of car, then it will be assigned a rate that is more expensive than its peers. Thus, some models driven by older people, like a Corvette, can be comparatively cheap to insure.”

Jeff, 25, married Pullman homeowner and minivan driver: $990 to $1,938