MikeO (@Goldrush70) · Nov 5, 2026
about US$735 a month, by Grok's estimate
TL;DR
What did MikeO (@Goldrush70) use Grok for?
Before their spouse signed a new lease, a driver asked Grok to run the numbers on keeping two cars versus sharing one, and got a one-page summary with the costs, the savings and the catch. Grok made a one-page summary they used to talk it through with their wife, and they decided to share one car. They say it took about 20 minutes.
What they did
They have two cars, and their wife was planning to replace hers with a new lease. They asked Grok to look at whether they really need both, giving it the payment, insurance, gas, maintenance, registration, mileage and how each of them drives. Grok added up the yearly cost of the second car, compared a new lease with sharing one car over three years, and pointed out the downside: selling the older car probably would not fully cover what they still owe on it.
How it went
Grok made a one-page summary they used to talk it through with their wife, and they decided to share one car. They say it took about 20 minutes.
"That works out to about $735 a month in our pocket."
— MikeO (@Goldrush70)
Worth knowing
- The answer is only as good as the numbers you give it, so use real figures from your statements. Sharing a car depends on your schedules, and the savings are estimates, not a quote from a dealer or lender.
- Price check: Grok: free plan; Plus (The X Subscription): US$8/month, or US$6.67/month on a yearly plan (US$80/year) (checked Nov 2, 2026).
Try it yourself
Paste this into a chatbot, then add your own details underneath.
Help me decide whether my household really needs a second car. Here are our numbers: [payment, insurance, gas, maintenance, registration, loan balance and current value for each car], and how we drive: [daily miles, work schedules, trips]. Compare keeping both cars, replacing one with [new lease or purchase], and sharing one car over three years. Include the downsides and anything we would owe if we sold, and put it on one page I can share with my partner.
Original post
See MikeO (@Goldrush70)'s original post on X → (Nov 5, 2026)
Filed under Admin & Inbox hacks
Sources
- MikeO (@Goldrush70) on X, Nov 5, 2026 — the original post
- Grok pricing — checked Nov 2, 2026