What mpg should a 1999 5.7 v8 2500 4wd suburban?

A 1999 Chevrolet Suburban 1500 (2500 is a heavier-duty model, but the engine is likely the same) with a 5.7L V8 engine will get significantly lower fuel economy than modern vehicles. Expect around 10-14 mpg combined (city and highway driving). Highway driving might net you closer to 14 mpg, while city driving will likely be closer to 10 mpg or even lower, depending on driving habits and vehicle condition.

Several factors influence this:

* Driving style: Aggressive acceleration and heavy braking dramatically reduce fuel economy.

* Vehicle maintenance: Properly maintained vehicles (tire pressure, tune-ups, etc.) generally get better gas mileage.

* Terrain: Driving in mountainous areas or constantly towing will significantly reduce MPG.

* Tire condition and size: Under-inflated or oversized tires negatively impact fuel economy.

Keep in mind that this is just an estimate. Actual mileage will vary.