Regarding fuel consumption.
Add: Fuel time / drive time remaining.
Should be pretty easy.

Taking remaining race time + decimals in lap time added.

Eg: Lap time: 1.30
Time remaining of race: 30 minutes
Laps remaining: 20
Fuel pr. lap: 3
Fuel pr minute: 60
Fuel in tank: 15 Liters

Fuel time remaining: Fuel consumption pr. minute x Time remaining of race

Fuel needed for end race:
Race: 180 minutess
Fuel pr minute avr: 3

180x3= 540L

Simple math with already existing info and given information is already there.