a FF Radian and 2 Snugrides w/ bases fit three across in the new CRV (tried it at the dealer.) Also, a RF Roundabout + RF Safety 1st Uptown fit side by side in our 2002 Accord. I think we could fit the FF Radian in the outboard too (just haven't tried it.)
We had trouble fitting the 2 infant seats with even the Radian in our Accord or 98 Volvo. If we hadn't gotten the Odyssey, we would have done: infant seat + base, FF Radian, infant seat w/o base.
Keep trying! You will find something that works
Sarah
DD1 5/05 Evenflo HBB
DD2 4/07 FF Britax Roundabout
DD3 4/07 FF Safety 1st Uptown
DD4 6/10 RF Britax RA50