I fitted a C7 fuel scoop on my Corvette. I don't see the problem with my 18ly range anymore. It takes time to get from point A to point B, but I like the ship too much. I do buy the odd ship now and then and engineer it, but I always end up selling it and go back to the Corvette.
I guess it depends what you use a 'vette for but both of mine have a jump-range of around 30Ly and that works fine for me.
One is a dedicated combat ship which I use for "peacekeeping" - in other words, keeping the BGS ticking along in the region near my home-system - and for difficult assassination missions.
The other gets used for mat' scavving and anything dubious.
If I was touring around the bubble, making things explode, a bigger jump-range might be desirable but 30Ly is plenty for how I use those ships.