I have a hyundai Sonata 2006 V6 and I would like to downgrade it to a V4 to save gas. Is it possible ?

Yep, trade that sucker off. I would not expect a grand amount of trade in for that model though.

ummmmmm, no. the 4 cylinder does get better gas mileage but you are changing you v6 in for one, unless you trade you car in for a car with a 4 cylinder

I don’t know about the Sonata but some 4 cylinders use more gas than a 6 cylinder due to less power.

Look Out! You want to make this change???. You will need to change the engine, transmission, CV drive axles. Might be cheaper to look at another car.

If you’re thinking about trading it in, weigh all the facts first. Will you be upside down on payments? In other words, will your payment go up and even out the price of the gas you’re currently spending? Insurance will/should be a bit less, but not by much. The ’06 Sonata should be getting you from 20-26 MPG based on your driving. I have an ’07 SE model with the V6 and I get about 21 MPG/city. I hope this helps you out.

NO such thing as a V4 anymore.

4 cylinder engines in all cars except for Subaru are Inline-4 engines, not V4. The Subaru uses H4.

Yes, it is worth it. the only difference is the engine, power, and gas mileage.

nope, not worth it, and no you can’t swap out the engine. You would probably lose about $3000 in trying to sell your car and replace with the same thing in an I4 engine. The MPG difference between the I4 and V6 is only about 2-3 mpg. So if gas stays at $4 per gallon and you can get 25 mpg with the V6 and 28 mpg with the I4, after 100,000 miles of driving you would save a grand total of $1700….how much are you going to lose in trying to change engines? Keep the car, it is fuel efficient as is, not like you are driving a Ford Expedition/Dodge Ram getting 15 mpg. Even the Elantra and Accent only average about 29 mpg, so the fact that you can drive a much better car with almost identical fuel economy should make you feel good, not bad. think about it!!!

First off, you will only be saving about 2-5 MPG by switching to the 4 cylinder. Divide 4.20 ($ per gallon) by 22 (the real avg MPG for the 4 cylinder). Then divide 4.20 by 20 (the 6 cylinder estimate avg.) The 4 cylinder comes up with 19-cents a mile for gas, while the 6 cylinder is 21-cents. Divide the cost of the switch to a 4 cylinder (let’s just say $4,000) by the 3-cents difference and this will give you a rough estimate of how many miles you would have to drive the 4 cylinder to make up for the switch. $4,000 = 133,333 miles.

In no way is this an exact or proven science, but you do have to account for the cost of the switch. We did the math and decided to use the wisdom of the Hypermilers (see link below) instead of trading in the car for one that gave us only a 10 MPG increase. Their techniques, though strange at first, really do work.

As for the car:
I have the 2003 4-cylinder Sonata, and I have to say that if you are planning on doing a lot of city stop-n-go driving, you will find that it is kind of gutless (especially w/ the A/C on.) Meaning you may find yourself stepping on it to get up to speed, and use more gas than the V6.

If you are a slow driver, or do a lot of freeway driving, then the four cylinder is great. On long trips the 4 cylinder has great gas millage (upwards of 30-33+MPG — no A/C).

Keep the tires inflated, the foot off the gas and utilize the coasting technique described in the cleanmpg.com article (below) and you should gain the difference between the 4 and 6-cylinder without the cost of the switch.

It’s not worth it.
You won’t save much.
Unless, you get a Prius or a Smart car.