Thanks @Fnord Velkor and @Teiri @Codger for confirming that my guess about my stored modules not affecting fuel consumption was correct, but any for sale in Outfitting WOULD affect it. I must say I'm not sure why this should be the case re the stored ones, since the more ships and modules on board mean the greater the mass and weight the carrier has to lug around, but I'm certainly not complaining! 
If however, the only mountains are lots of sharp pointy ones and are all close to each other, then I usually just forget it and move on!
I've found that how easy or hard it will be to find and collect Fungoida depends on the type of mountain ranges they are located in. If the mountains have plenty of nice flat plateaus that are easy to land on then go for it, as they are often easy to spot and collect on those plateaus.So far the thing i got most of the prob with is fungoida. Just in case you're lucky enough to get a variant growing in the mountains, your screwed. Either suffer it in SRV, either climb, and you never know if they grow on the other side... Fly and see from your ship and then land (where you can, far?) and figure where you saw them...
If however, the only mountains are lots of sharp pointy ones and are all close to each other, then I usually just forget it and move on!