How does a charge get its cost?

Roamer uses the first of these it has:

A total you entered on the charge.
A rate you entered on the charge, or the price of the saved place where you charged. At Home, that's your Home rate.
$0 for a free charge on the Rivian Adventure Network (RAN).
For a DC fast charge, the cost Rivian billed.
Your default rate.

Drives use your Home rate, or your default rate if Home doesn't have one.

Set your default rate under Charging costs in Account → Preferences. Your Home rate is the price on your Home place in Locations.

Why does a charge away from Home use my default rate?

If you paid for a DC fast charge in the Rivian app, whether on the Rivian Adventure Network or at a Tesla Supercharger, IONNA or Electrify America charger, Rivian has a bill for it, and Roamer uses that bill unless you've set a price for the place.

When you pay another way, in the network's own app or with a card at the charger, there's no Rivian bill. For those, and for Level 2 charges, Roamer uses the price of the saved place where you charged, or your default rate if you haven't saved it. That cost is an estimate, since Roamer can't see what you paid.

To fix one, enter what you paid, or 0 if it was free. To find charges still on an estimate, open Activity, choose Charges, and pick Unconfirmed under Cost.

If you'd rather leave charges like these without a cost, clear your default rate under Charging costs in Account → Preferences.

How do I change what one charge cost?

Open the charge, choose Edit, and enter the Total Cost. A DC fast charge with no cost also shows Add what you paid.

Enter a total when your receipt has a discount, a session fee or tax, or when you paid a different price from your rate.

I changed my rate. Why didn't old charges change?

A new rate applies to charges from then on. To update earlier ones, choose Also update past charges when you save your default rate, or Recalculate charging costs when you save a place's price. For your Home place, that updates every drive too. If you cleared a place's price and recalculate, its past charges get your default rate.

Totals and rates you entered on a charge, and DC fast charges Rivian billed, stay as they are.

Does Roamer support time-of-use rates?

No. Each place has one rate. For a charge that crossed rate periods, enter what you paid as its Total Cost.

How are fuel savings calculated?

Roamer compares what your electricity cost with what the same miles would have cost in gas, in a 25 MPG vehicle at the US weekly average price of premium. A drive uses your Home rate, or your default rate. A charge compares the range it added with what that charge cost. Each one keeps the gas price from the week it happened.

With Roamer Plus, you can set your own comparison under Fuel comparison in Account → Preferences. Past drives keep the old comparison unless you choose Also update past comparisons.