It's not that I didn't consider economy, it's that I chose the car that best suited my needs. Which are (and remain) primarily highway driving. Large Australian sedans make large journeys feel like laps around the block. The commodore isn't too bad at fuel economy either, it could just stand to be better.
Cheap real estate sign is available in 2600x1200 for $25 a sheet. Any signwriter should be able to point you to it.
Unfortunately the Commodore has exposed wipers and full time power steering. But I'm not willing to remove either. What I am willing to do however is replace the wipers with low profile flex bladed items when they next need replacing.
Perhaps another thing to try would be a water injection setup. The vacuum operated system on my Legacy GT (while I was in NZ) got about 10km a tank through keeping the engine clean. The catch can probably got similar results for the same reason.
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