Why would a VX have greater potential than a Metro?
I'm mainly talking about highway FE performance. Despite the ability to achieve ridiculously good efficiency in city driving, I normally use my car more on the highway, where the VX excels and the Metro suffers.
It's about the speed at which the 2 cars attain their EPA highway ratings.
With wheel skirts & grill block (+5% mpg), the Firefly met its EPA rating of 49 mpg at 60 mph (flat road, steady speed). At 55 mph, I saw about 54 mpg. Dan, on the other hand has shown he can keep the VX in lean burn (without drafting) and get 75 mpg at 55 mph. Nuff said.
If we made a top 10 list topic of: "MPG / avg MPH", the VX would be on top.
I think I'd kick his butt in the city/suburbia though
So if that's where you do most of your driving, the Metro may be the one to have.
EDIT: I shouldn't be so brash: Dan says he hasn't P&G'd the VX much. maybe it's got monster potential in town too...