I've read about the "bicycle" upgrade idea. I have a way to do it that won't increase inflation. Well, first, I'd prefer a better name. Maybe "super Mars buggy", an upgrade from the regular buggy you start out with. Somehow I doubt a player is covering that much territory on foot per day.

First, you would have to have to make it so a player has level one radar.
Next they buy the buggy upgrade.
Now, when they activate the extra speed, it moves them two spaces instead of one when they click a direction. That way, they'd only hit 250 spaces, even though they've gone twice as far. The reason they have to have the radar first is so that you don't end up with people complaining, "But I missed the settlement! Not fair!" and such.
They'd be able to do actions on the squares they land on, but not the spaces in between. If there's something one square away that they want to hit, they'd have to dismount/disengage the buggy to travel to that square.
Also, say a person travels north, skips a crater and lands on a dune. Instead of the little dune image, there'd be a dune image with a smaller crater image on the bottom portion of the picture, so that the player could easily see what they've skipped. Sure, they could figure it out from their radar, but this would be quicker, more visual, and give the feeling of speed.
Hmmm... I've been thinking, you wouldn't land on any extra squares with the transport upgrade, but if you can mount/dismount anytime you want, odds are there'd be a higher percentage of your moves that end up on volcanoes/ruins. I think you could fix that by charging one move to mount/engage the speed boost. That way people couldn't just use it to pimp out their volcanoes, but if they hit a settlement the charge won't be so excessive that it po's anyone. You should NOT charge to hop off, though, because that would just be excessive to charge for both.
Actually, make the first mount of the day free. That way, you be able to travel the full 500 spaces if you were on it the whole time.
*edited to change it from a dismounting, to a mounting charge, because that would likely result in less irritation*
Whadda ya' guys think?