Tho nowhere near the info with Navi,
HAHs without Navi do have 2 mpg readouts:
Trip A, setting 1 gives odometer and mpg since last reset;
Trip A, setting 2 gives outside temp and mpg....
Trip B, gives outside temp and mpg.

By using A for tank mpg, I reset B fairly often, keeping track of mpg for a 40 mile commute, resetting for mpg on return. By resetting B within a trip, you can get current mpg, updated every 10 seconds. It's no Navi, but it's more than just one mpg readout.

Lewis