State Farm Insurance has recently offered a discount to policy holders who allow their Onstar equipped vehicles to provide mileage data to State Farm. According to SF low mileage drivers can receive a 1% to 45% discount on their premiums. Believe this is a test program only available in Texas and California.
http://www.statefarm.com/insurance/auto_insurance/drive_save_safe_faq.asp
http://www.statefarm.com/insurance/auto_insurance/drive-save-safe-ca.asp
http://www.statefarm.com/insurance/auto_insurance/drive_save_safe_faq.asp
http://www.statefarm.com/insurance/auto_insurance/drive-save-safe-ca.asp