Does anyone know if this is normal on the Aveo. When the car is parked on an incline and the front is facing up, the petrol guage shows fuel, but when its parked downhill with the front facing down the guage shows almost empty.

well,what does the petrol gauge show when it's parked on level ground like normal?if it's full,then the float has no choice but to show full! example>>what would the oil dipstick show if the front of the car was facing down hill on an incline? then,what would oil level be on the dipstick with the front of the car facing up hill on an incline?

Can't compare gas guage readings on different vehicles when parked on an incline due to the location of the tank sender... Some are in front of the tank and some are in the rear of the tank.. That makes a big difference!! Unless the tank is FULL.. It's normal for GM fuel guage readings to vary 1/4 tank (25%) difference depending on what position it's parked in on an incline... IF the guage is showing near empty when on level ground... **Best put some gas in the tank** .. Never rely on gas guage readings unless on level surface, goes for all vehicles.