See..there you go. A lot of Sienna owners are bragging about their 35mpg. Great. But what's the downside? Loud, lethargic engine. Try doing 40mph on an off ramp, then have to accelerate to 70-75mph. Super sluggish. Super loud. It's not worth it. For a big vehicle like this, you need a proper V6. I will gladly take the trade of gas mileage in favor of a faster, better acceleration vehicle any day of the week. We got 28.5 on ours on two road trips. Nothing wrong with that.