Also in the private sector they don't usualy hand a car over to you as well.
Depends...Some scenarios I've personally had or have had peers who have had.
- Mileage only - Most common
- Car allowance - 2nd most common. You get "X" amount of $$ per month and that is supposed to offset your car payment/maintenance. It is up to you how you leverage it. Some go out and buy a more expensive car and end up putting 100k a year on it. Smart people buy a honda civic for the MPG and while they don't profit, their out of pocket costs for personal transportation is lower.
- Co-pay. This one is growing in popularity with companies that would traditionally issue a company own car. A new car is provided every two years. The employee gets to pick between 2 or 3 models. The employee has "X" amount of $ taken out of his check to account for "personal use". I had a neighbor that worked for a large food company... For his $160 per month, he got was essentially was a company vehicle, insured by the company, with gas paid for by the company. Due to his $160 per month contribution he was allowed to drive the car on personal business without too much fear of being in an accident. That is a pretty good deal. $160 per month, insured.
- Company issued car... This one started going the way of the dinosaur about ten years ago. Too many restrictions on employee as to personal vs business use, and that use can't readily be restricted anyway... hence companies going to the model of company vehicle above.
For the CA lawmakers to get a monthly allowance PLUS mileage is strictly smoke and mirrors.