Over a little more than a year, General Motors (GM) has seen growing interest in Maven, its on-demand ride-sharing service.

The program is already available in 17 cities across the U.S. and Canada, but up to this point the service was limited to rentals on an hourly basis.

Now the auto maker is adding a new plan with a longer-term rental option.Called Reserve, it’s a monthly fee-based plan that lets customers hold onto either a Chevrolet Tahoe or an extended-range electric Chevrolet Volt for 28 days.

The per-month price varies depending on the vehicle, with the former priced at $1,500 and the latter at $1,100.

But included in each reservation is parking, insurance, and $100 worth of gas.Maven’s Reserve will only be available in San Francisco and Los Angeles to start, although there are plans to extend into other cities.“At Maven, we’ve matured our platform to meet the dynamic lifestyle needs of our members through multiple sharing solutions,” said Julia Steyn, vice president of GM’s urban mobility and Maven division in a statement.

“Maven Reserve is an innovative approach that answers requests from members for longer-term reservation options.”Launched in 2016, Maven competes against Zipcar, Getaround, Carma, and traditional car rental services, such as Enterprise, Hertz, Avis, and Budget.

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