The cheapest option starts at $10 per month for 1 gigabyte of data (down from $20 per month), while the a 10-gigabyte monthly plan will now run you $40 per month. There's also a new goldilocks 4 gigabyte plan for $20 monthly and a flat-rate $150 annual plan that now gives you 20 gigs to spread over the course of a year.

According to Chevy, it's the big-truck guys guzzling up the LTE data: Silverado drivers consume the most, followed by users with Suburbans, Tahoes and Traverses. Although that could change once autonomous Chevy Bolts free more drivers from the hassle of having to actually look at the road.

Overall, in-car data usage is has been steadily on the rise since it was introduced in late 2014. "With these lower prices, we expect even more customers to use 4G LTE connectivity during this busy summer driving season," OnStar's manager of marketing strategy Laura Keck said in a statement. Oil prices, on the other hand, just shot up.