Vehicle mileage

One thing with diesels they do not like short trips and what I mean by short trips the vehicle needs to be started idle and driven for a minimal of 40 minutes 4 engine to fully heat up to prevent excess carbon build-up and if it has a lot of miles on it you are exhaust could be getting plugged up or restricted especially if it has a a catalytic converter on it if it's plugged up with suit you will get bad fuel mileage much same thing with your air intake a dirty air filter can rob you of power and fuel efficiency same thing on the exhaust side if a diesel can't breathe then it will gobble up more fuel then it needs and diesels need to have fuel treatment / injector cleaner that is meant for diesels ran through them at least every third fill up to prevent the injectors from getting clogged which will damage fuel efficiency and help prevent burning holes in your Pistons which is true with any injector gas or diesel and from my Google search of your vehicle the 3.2 L sized engine gets about the fuel mileage that you say you're getting if it's the 2.2 it should be getting 20 two 25 City and 38 to 40 Highway

before replacing injectors try adding fuel injector cleaner to gas tank.......
also check air filter, and if not done in awhile change sparkplugs


Do you smell gas?

I WOULD SAY YES BECAUSE THE LUCAS FUEL INJECTOR CLEANER IS JUST HELPING THE INJECTOR SPRAY BETTER

Long cranking indicates a problem with part of the fuel pump assembly or the need for an air filter / tune-up. A restricted fuel filter also reduces fuel pressure to the injectors slowing cranking.

High mileage? Try a few bottles of Gum-out with a tank of gas, not the expensive stuff, just the regular fuel injector cleaner, then repeat & see if it improves. If it does, that would indicate Injectors and or fuel filter.

good luck

when was the last time you put in fuel injector cleaner? I put in Lucas Oil Injector cleaner every other or every oil change.

There are alot of factors affecting your gas mileage. Tire wear, tire pressure, wheel alignment, air filter, fuel filter, spark plugs, oxygen sensors, just to name a few. So to say what you need is just shooting in the dark without more information. I would probably start with your oxygen sensors, and then perform a tuneup. If your vehicle pulls to one side or the other when driving on the highway you need to stop into the shop for a wheel alignment.