Four to nine MPG, depending on a number of factors. It's pretty much the same with any tractor trailer.
EGR Valve
Number one eve valve
Caterpillar C series, Cummins IS series, or Volvo VED series.
There'll be a sticker inside the door frame on the driver's side with this information on it.
Too many factors to give a be-all, end-all answer, including year and make, engine, gear ratios of transmission and rear ends, tire size, terrain, load weight and profile, etc. Volvos with the Volvo engine are traditionally good for mileage with optimal aerodynamic loads, such as a tanker or van trailer, but not so much for open deck trailers.. I've reports of 8+ MPG average, but I certainly never saw it pulling an RGN with a Volvo.
That depends on the length of the power unit and the weight of the trailer. With a Kenworth W900L with a 265" wheelbase and a 53' stepdeck trailer, I had an overall length of 77 feet. With a Volvo VNL730 and a 48' flatbed or stepdeck trailer, I was right at about 67 or 68 feet. Heavy haul combinations can be significantly longer, but 65 to 78 feet would be about the norm for an over-the-road regional or line haul tractor pulling a single trailer.
The more high end tractors are the Kenworth W900L, Peterbilt 379EXHD, Volvo VNL64T770 and VNL64T880, the International 9900ix, and the International Lone Star.
Yes, they do, if you're referring to tractors in the context as they're applied to tractor-trailer truck combinations. Volvo Cars and Volvo A.B. (the truck manufacturer) are no longer affiliated with each other, by the way. Volvo Cars was sold to Ford Motor Corporation, who I believe later sold it to Tata Motors.
Volvo dealership. Have fun with that... if you've never taken off a Volvo starter, you could be in for a lot of excitement.
Before you have to do any repairs, you have to diagnose exactly what's wrong with it. If it's malfunctioning, it could be for any number of reasons, and there's really no answer to this question without knowing what that is.
The EPA mileage estimate for the 2007 Volvo XC70 is 16 mpg in the city, 23 mpg on the highway.
The EPA mileage estimate for the 2007 Volvo S80 is 16 mpg in the city, 25 mpg on the highway.