Removing the fuel tank on a gen 1 volt looks easy but you have to remove the rear axle to get the tank out. I have replaced one fuel pump, which you have to remove the tank. As far as replacing the tank with a Cruze tank, it would not fit or work with the pressurized evap system on the Volt. You are stuck with the smaller fuel tank.
There's that plus 9 gallons x 40 mpg gives you 360 miles and you should stop anyways to take a break, jog around to get the blood circulating, give the brain a break, eat, etc. I remember back in the day I did a none stop drive from Winnipeg to Calgary (breakfast at Brandon) and when we stopped for supper at Medicine Hat while I was sitting in the booth I could still see the road rushing at me at 60 mph. Scary. (Google Map it).
Thd Cruze has an entirely different fuel system including the tank. The Volt fuel tank is steel. The cruize is plastic. Will not fit. Even if it did the On Board Diagnostic system would give you numerous MIL codes. In today's world you cannot swap parts from different cars. Your cars diagnostic system would detect it and give a code. Some would disable the car.
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