Even though a 1995 940 sedan weighs close to a '95 Jeep Wrangler, with almost the same 4-cylinder displacement, will the 940 still get better gas mileage than the 4wd Jeep? I have been told that even the heaviest 940 model will get better fuel economy than the lightest Wrangler. And I have heard both engines at idle; the Volvo B230F 2.3 four is quieter than the Jeep four or straight-six, wouldn't you agree?

Chris' points are spot-on. My wife's 940 gets an average of 25-26MPG. It's a fairly hefty car for just a NA 4-cyl (3400lbs), but it makes the most of it.

The Wrangler's 4WD indeed sucks gas even when not engaged - there are still parts reciprocating (hence extra rotational mass), as well as simply more parts (extra shafts and differential(s).)

Aerodynamics? Well, the 940 has a Cd of about .36, still good even by today's standards. I don't have a number for the Wrangler, but I guesstimate about .5? Over 35MPH, you'll be burning a lot more gas to plow the Jeep through the wind.

Tires - the Jeep likely has tall, wide tires. Tall is good for efficient gearing (assuming the final drive isn't really short), but it's also bad in that the sidewalls flex a lot (energy lost as heat), and wider tires have more rolling resistance. The 940 has 185/65-15's, pretty skinny.

Noise - well, the 940 is a luxury car. It has a lot of sound dampening inside, as well as an underhood mat to keep the mechanicals quiet. The Jeep is a utilitarian vehicle that was never meant to cosset its occupants.

Well, figure that the Wrangler also probably has 4WD, which sucks gas just to turn the parts when it isn't engaged. Plus if it has 4WD it's probably--but not definitely--riding on tires that have more resistance (fatter).

Also a Wrangler has crappy aerodynamics. So, even if the 940 takes more gas to GET to speed, the Wrangler probably takes more just to keep it AT speed.

I think the 940 is quieter than a 4cyl Wrangler for certain. The Jeep four cylinders make a real racket. Half of it is because they are usually not insulated very well.