When should you replace spark plugs on a 2008 Prius?

Check your air filter,probably needs changing.Replace spark plugs.

I'm not sure of the mileage on your truck, but there are a number of things that you can do to improve your gas mileage. If the truck has over 100,000 miles, the next time you change your oil you can choose engine oil that is specifically designed for high mileage vehicles (make sure that it is the correct weight for your vehicle) Change your air filter, this has alot to do with fuel efficiency. Make sure that you get your tires rotated and balanced every 5,000 miles. Also check your tread wear on all 4 tires. If you have significantly uneven tread on your tires this can have a drastic effect on mpg. Check your plug wires: if they look worn and old replace them. If they appear to be in good shape then you can get away with only getting new spark plugs. If you are really dedicated to the truck you can always opt for a fuel system flush at your local service station, I know they offer this service at Midas in my area for $99. Lastly I used to have 98 Stratus that got poor gas mileage. I started putting a bottle of the STP treatment (in the black bottle not red) during every fill up and it averaged an extra 40 miles per tank. Hope this helps.

When was the last time the spark plugs and air filter were changed? Also check trunk weight and tire pressure. But honestly, the best way to improve MPG is by how you drive - fast acceleration will burn more fuel, keep the speedometer at an even keel whenever you can vs. constant changes in acc/dec.

www.fueleconomy.gov list the mileage for your vehicle at 29/19. I don't know what kind of mileage you have been getting, so I have nothing ot compare it to. You could be due for a tuneup, air filter and oil change. Scan the computer for trouble codes that may be stored in the computer and clear the codes. Keep your tires aired up to the max recommend pressure on the tire sidewall. All these things will improve fuel mileage. Great performance and mileage increase. Cold weather can affect fuel mileage as the engine runs richer until it warms up. The gas at the service stations has a lot to do with fuel mileage. Especially when they switch over from summer to winter formula. I got a boost in mileage and performance with a set of E3 spark plugs.

Hello. Welcome to FixYa.

Id the Prius economical? Sure. They are great little cars, and the gas mileage is tremendous. Some of my customers are reporting up to 50 MPG on trips...pretty good gas mileage.

GIven the choice of a Prius, versus the other hybrids on the market, the Prius cannot be beat.

Change air filter and pcv

24 mpg on the highway is actually pretty good for that truck. at 48000 miles and being 3 years old its time for plugs, air filter, and fuel filter if available. thats cheap maintenance for now. but if very self conscious, run some fuel injector cleaner first, then change the plugs, because any octane booster or fuel injector cleaner can run the risk of fouling out a plug, by creating a hotter spark then what, normal gas does. the burn is hotter.

You are always going to get worse gas mileage with E85 than regualr gasoline.  My sister has a colbalt and she mixes 1/2 gas and 1/2 e85.  The dealer told her she could do this to improve mileage.  I would not try it in your car unless you check with the dealer first, it could mess your engine up if you do it.  If you are getting that mileage with gasoline, then i would change spark plugs to bosch platnium 2 or something that allows more spark.

change your spark plugs if they haven't been changed in awhile. check your tires for the propper psi there should be a sticker on the inside of your drivers door that will tell you recomended air pressures go by this not the recomendations on the tires. also where are you getting you gas does it contain ethanol sometimes this can burn faster.

What was the weight of the oil that was put into the engine when it was changed? Prius engines are VERY PICKY about the proper weight of the engine oil. Trust me. I see this quite often. The wrong weight oil can do bizzare things, and def lower your mileage. Something you can check: Take off the tube leading to the throttle body, and look down into the intake. Do you see any oil laying in the intake manifold? If so, you DEF have the wrong weight oil. This will NOT set a Check Engine light, either. Hope this helps.