Yes, both have caused me to re-evaluate and consolidate plans, to be honest.
For gas prices:
That's one of the two main reasons that we are doing day camp only this year, and all the kids go to the same place (they're separated out by age though). We are also sort of carpooling with a friend that has only one child, that lives nearby. So she's kicking in some gas money, I'm picking up and dropping off her kid (since he's on the way to camp, and I've got the van plus a convenient extra carseat).
DD will be limited in her choice of extracurricular activities next year. She's very very into her dance, so she can still go to her favorite teacher even though it's a splurge gas wise. However...her other activities must be at the school after school (there's a bunch to choose from) so I don't have to drive her somewhere else. Her brothers will be similarly limited.
We try to limit family fun trips to the zoo or aquarium or children's museum (we're members of all three) to once every few months. The memberships still pay for themselves, since we've got 5 people in our family.
For environmental stuff:
I no longer buy "snack package" foods. Or convenience items. Which kind of sucks sometimes, but it's cheaper and less packaging. We also have #2 water bottles (the supposedly non-leaching kind). I can't bring myself to spend $25 on a stainless steel bottle, that's $75 for the kids alone. BUT if they show they can take good care of their plastic ones over the summer and not lose them, then I will consider it for the fall. For camp/school lunches I pack bentos.
We eat a lot of twice or thrice prepared leftovers too, with food prices going up plus wanting to cut down on the amount of meat we buy for environmental reasons, I prepare meat about twice per week now, though I'd say we have meat in our meal about 4 or 5 times a week, just in way smaller amounts and stretched out. We eat a lot of fresh fruit and veggies, but tend to stay local. Once the local harvest seasons starts (early June) we ONLY eat local veggies that we get from our CSA farm (the share is large enough that I end up putting up some of it every week). So that's a cost cutter plus an environmental thing. Unfortunately I do have a to drive a short distance for the CSA farm. I will probably walk down to the U-pick farm that's a little closer this year to see if I can hack walking there once a week for supplemental berries and veggies. I've been getting in better and better shape, I think it's feasable...probably not with the kids though. I might have been able to if they were still stroller-age.
Now that my kids are older and not QUITE as messy all the time, I have them do (with my supervision for now) a spot check on their clothing at night. If it's not dirty (shirts and pants, underwear and socks always go in the hamper) then we turn it inside out and hang it up (the only time we hang up clothes in this house!!
) to air out overnight and the next day, and they can wear it the day after or use it as spare clothing. That's cut my laundry load by about a 1/3rd. (And it's cut my DD's laundry by half!).
Switching over to cleaners we make ourseives (except for I can't totally get rid of my bleach, I know, bad mama) and using reusable spray bottles saves a LOT of $$ and has helped me let go of my control issues and allow my kids to help me clean more.
If it helps, I don't dream up things for my kids to do.
I rotate toys, might put out different art supplies once a week, ect...but like others have mentioned boredom isn't terminal, and it can be good for kids to work it out how to entertain themselves. I figure my main responsibility, with them being 6, 5 and 5 is for me to supply the tools, and then stay out of the way and let them figure out what they want to do with them (within common sense reasons of course).
Easy for me to say though. I've got three kids, they have complementary personalities to each other, and they're all homebodies too.