Belated welcome to EcoModder, TDFbound!
Glad the VX acquisition and retrieval adventure went smoothly.
Here's one thought I had, maybe a bit too late for your purposes: the MPG magic in the VX lies mainly its ability to go into lean burn mode, which it really only does under lighter engine loads.
So, if you're mostly driving on hilly/mountainous roads, you're not going to be seeing the benefit of lean burn. It's more useful to a flatlander. The car's unusually tall gearing might be counterproductive, too. A vanilla DX or CX (though they're geared pretty high too) might have been easier to find, and do practically as well under your particular circumstances.
PS: mountain driving can be more fuel efficient than flat land driving. The key is not using any fuel at all on the descents! Same reason as "pulse and glide".
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