Michigan Drivers: Is Your Start/Stop System Really Saving Gas?

You pull up to a stop sign. You’re waiting to turn left onto a moderately busy stretch of road—think Grand Blanc Road in Genesee County, Bay Road in the Tri-Cities, or US-31 along Michigan’s west coast.

Traffic is steady in both directions. Not impossible, but tight enough that timing matters. You’ve done this a thousand times. You know you can thread the needle.

You lift your foot off the brake to roll into the turn—and there it is.

A pause.

A hesitation.

The engine that was just running is now restarting, costing you a split second right when you need a smooth, immediate response.

It’s tiny. Just a fraction of a second. Barely noticeable on paper.

But in the moment, it’s enough to feel it—and enough to annoy the hell out of you.

Sound familiar?

Why Do Modern Cars Shut Off at Stoplights?

If you drive a vehicle manufactured in the last 15 years or so, chances are it’s equipped with an automatic start/stop system that temporarily shuts off the engine when the vehicle comes to a complete stop. The technology is marketed as a way to improve fuel economy.

And with gas prices hitting a four-year high, every little bit helps, right?

Michigan Drivers Hate Start/Stop Systems

But does it really work?

Automatic start/stop systems are among the most-maligned features in modern vehicles. The internet is full of critics who claim the systems are hard on engines and starters, while doing little to actually save gas.

Those claims, however, aren’t backed by much evidence.

Research Shows Start/Stop Can Save Fuel

But there is evidence to support the idea that automatic start/stop systems really do save gas.

Testing cited by Consumer Reports found vehicles equipped with the technology achieved fuel savings ranging from roughly 7% to more than 25% under certain driving conditions. That’s not insignificant, especially with Michigan gas prices climbing higher heading into the summer travel season.

There’s a catch, though.

Most of those savings happen in situations where drivers spend a lot of time sitting still with the engine running—think heavy city traffic, long red lights, stop-and-go commuting, or crawling through construction zones.

In other words, the system doesn’t really save gas while you’re driving. It saves gas while you’re not moving.

Why Driving Habits Matter in Michigan

That distinction matters in Michigan, where most of us spend more time cruising highways, rural roads, and suburban stretches than sitting in stop-and-go Detroit traffic every day.

So while automatic start/stop technology absolutely can reduce fuel consumption, the real-world benefit may depend heavily on where—and how—you drive.

And personally, I turn that system off every time I get in the car.

That doesn’t mean automatic start/stop technology is useless. In the right environment—dense traffic, long idle times, and constant stop-and-go driving—it clearly can reduce fuel consumption.

But for many Michigan drivers, especially those outside major urban areas like Detroit or Grand Rapids, the fuel savings may not be enough to outweigh the frustration.

The debate over automatic start/stop systems has become so heated that the federal government is now reconsidering incentives tied to the technology. Earlier this year, the EPA announced plans to eliminate fuel-economy credits that encouraged automakers to install the systems in new vehicles, with EPA Administrator Lee Zeldin calling start/stop one of the “most hated” features in modern cars.