I decided to buy all the modern 1:48 vehicles as advertised by Menards. They are advertising a van, ambulance, and a set of 1:48 vehicles (16). I ordered them all at once.
Here is a pic of all of them (well the 16 autos are just sampled).
THE BMW
Searching images on google, i arrived at a match of the 2012 BMW 328i. This matches very well. Some obvious cosmetic differences are lack of BMW circle badge, no license plates, and the columns behind the front seats should be black on the outside, not red. The side mirrors are also way too small. Other than that, it is a very good (though not detailed) match.
This model length measures exactly 4-1/16" with my ruler. The width is 1-5/8". According to this website, the car should be 182.5 x 71.3". So 182.5/4.0625 = 44.92 and 71.3/1.625 = 43.87. This this is about a 1:44 vehicle.
THE VOLKSWAGEN
This seems to match up to the 2012 VW Passat. It does not match as closely as the BMW, so I may have the wrong model year. But I don't think so. The front headlights are a bit high in the body and the column in the rear seat doesn't angle right. Otherwise stuff matches up, but not as well as the BMW.
This model length measures exactly 4-1/8" with my ruler. The width is 1-5/8". According to this website, it should be 191.6x72.2. So 191.6/4.125 = 46.69 and 72.2/1.625 = 44.4. So this is about a 1:45 vehicle.
THE NISSAN
I am pretty sure this is a Nissan Altima, but I cannot find a good picture match on google. Usually the front and back lights are slightly off. Let's go with the 2010 sedan.
This model length measures exactly 4-1/8" with my ruler. The width is 1-9/16". According to this website, it should be 190.7x70.7. So 190.7/4.125 = 46.2 and 70.7/1.5625 = 45.23. So this is about a 1:45 vehicle.
Overall, I think this is bad. The headlights and taillights and front grill and back trunk lines don't match even closely to any photo I can find. This seem like the worst so far.
THE BUICK
This is a 2012 Buick Lacrosse.
This model length measures exactly 4" with my ruler. The width is 1-7/16". According to this website, it should be 196.9x73.1. So 196.9/4 = 49.23 and 73.1/1.625 = 50.9. So this is about a 1:49 vehicle. YAYYY! Finally something outside of the 1:43 realm. YAYYYY! THIS IS A KEEPER FOR ME! As a reality check, if I put it next to the other two I just reveiewed, it is clearly shorter and skinnier despite being based on a larger prototype.
THE SUBARU.
Well I look through all the pics, and this is clearly Impreza WRX Hatchback.
LOOKS LIKE I GOT THIS ONE WRONG - I THOUGHT IT WAS THE OUTBACK. The length is 3-15/16 and the width is 1-7/16
THE TOYOTA
This is a 2010 Toyota Avalon The front and rear lights are off by a little bit, but not as bad as some of the others above.
This model length measures exactly 4-1/8" with my ruler. The width is 1-5/8". According to this website, it should be 197.6x72.8. So 197.6/4.125 = 47.9 and 72.8/1.5625 = 46.59. So this is about a 1:47 vehicle. I WILL KEEP THIS! YAYYY!!!!
THE AMBULANCE.
I haven't taken this out of the box yet, but it looks big. I have two 1:48 pickups that I put next to it for comparision, but I cant' decide if the ambulance is really 1:48 or not. It's hard to compare half-ton pickups to a 3/4 ton ambulance. I'm not going to review this any further because somebody already did. I don't think I'll keep this because it looks so big, but I'm not sure.
THE MENARDS VAN
This is clearly a 2005 GMC Savana. The cardboard container says 1:50 right in big letters, so I don't know why this is advertised on the web site as 1:48. It's only 4" long or so. That makes it a 1:55 model. It won't roll more than an few inches if you push it because the wheels are really wobbly. You'll be sorry if you put this guy on your layout next to 1:43 vehicles, but I am going to keep it because I love 1:50 vehicles. They make my trains look bigger by comparision.
So there you have it. The Menards van was very small. Half the 16-pack of autos are 1:48-realm, while the rest would work better with other 1:43 entities. Overall the BMW 328i was very accurate, though it was too big for me to use. The Buick, Subarus,and Toyotas were my favorites and will be great for my layout.
I should mention that the 16-pack of cars had windup mechanisms where if you pulled them back, they will roll forward on their own for about six feet or so.