For us, the one bedroom saves $$$ on food for sure, although the other amenities are a big plus as well. We usually fly, so we always rent a car (can get 20% discount with Alamo for
DVC), so usually $30 for small rental. We go to the
Walmart Supercentre (they have a great Disney souvie area as well as food). For 12 nights and 4 of us, I buy groceries like I would at home, sometimes a few different things or extras to mix it up a bit since we're on holidays. We usually spend about $200 for the 12 nights, and that includes beer, pop and water and lots of snacks. I try to pack the condiments and bring with me to save extra, since I take them home (ketchup, mustard, relish, staples like peanut butter, honey and so on, all in plastic containers and sealed in zip-loc bags in my checked luggage.)
We get breakfast foods, (eggs, cereal, toast), lunch items (lots of sandwich meats, cheese, soup), and for dinner, usually frozen pizza, spaghetti, hamburgers, hot dogs (all the types of things we'd order at CS restaurants anyhow), plus ice cream, chips, popcorn, cookies, etc. We always buy an extra loaf of bread to feed the ducks from our balcony at OKW.
If I added up twelve days of dining for four of us, I'd probably faint!
The dining plan is too expensive as well, even though we get nice meals for it. Our vacations are take a day at a time kind, so having daily ADRs would never work anyhow. We always take a midday break and have lunch to cool off and relax, and we like to sit out on the balcony at the patio table and have dinner in the early evening before heading out to whatever EMH there are. We love our 1 bedroom and having the 'down-time' to share a meal - and it's always 'fast food' so to speak, so I never feel like I spent all day in the kitchen - most times everyone just makes themselves something, so it's not a big production of preparing a bunch of food. Clean up is easy with the dishwasher, and off we go somewhere else or back out onto the patio for a game of Uno!
Now for this trip, we are spending the first week at the AKV in a studio because we really want to stay there and didn't have enough points this year to do a 1 bedroom for the first week (second week is 1 bdrm at OKW

). We're also driving down this year, so I'll be getting a few days' worth of food for the studios that doesn't require a stove. I'm taking our little George Foreman grill for burgers and hot dogs, and we can microwave soup and buy the fixins for subs and sandwiches as well - we won't starve in a studio either. I'll get more groceries when we move to OKW, but we only have five nights there, so it won't be a lot then either. Our first week we have an ADR for WCC for DD's 13th b-day, so that's one night we don't need groceries for, although it means extra $$$.
And I have to put some money aside for the Mickey's Ice cream we must have, plus the cherry turnovers at the MK bakery, but that is soooo necessary!
