What Car? Q&A - Introduction

Where should I position my portable satellite navigation system? Could I spend more than £4000 a year on fuel? What on earth is a low-ratio transfer transmission?

These and other motoring queries are answered by the whatcar.com Q&A team this week.

If you've got another question, especially one on winter motoring which is next week's theme on whatcar.com, then click here to send it to us. We'll publish a selection of answers here every week.

Don't forget you can also turn to the What Car? Helpdesk with motoring disputes you might be having. Click here to e-mail the Helpdesk.