What size tire do you recommend for better gas mileage ihave 235x60x14 on it now.should i go with 225 x70x14 or 15

Check the air in your tires; one might be low. That happens especially when temperatures cool down (like now) and one or 2 tires go below the pressure limit because of the lower temp and pressures.
It's a good time to set all your tires at 36 PSI or whatever is recommended for your vehicle or tire.
I err on the high side, so when temps get lower, you still have good pressure; plus, higher pressure is more resistance against hydroplaning, and better gas mileage!

That 215 is wider and will have more drag, lesser gas mileage.

The size of the engine alone will not determine gas mileage. There are many other factors including vehicle weight, design of the motor, etc. So in answer to question 1, size isn't going to matter.

For question #2, make sure you change the oil, oil filter, air filter and keep the tires inflated to recommended specs. That might help you out a bit...

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155/70R13 is stock but if it doesnt rub you could try a littly bigger but not recommended

Hello there:
If you look at your owners manual it will tell you that it is recommended that you only use the 89 or greater octane fuel and any thing below this can damage the engine i have the same truck and i have dome a lot of testing with the different fuels and they are right if i spend the extra 5 or 6 cents to get the good fuel i get better fuel mileage along with following the a regular tuneup intervals and also keeping the tires properly inflated helps out a lot ok So try these easy steps and you will find out that you will start getting better mileage

There are a few things you can do to improve your gas mileage. First of all, check the tire pressure. If you are not running at the recommended psi, on the label on the side of the drivers side door, go to a gas station and get your tires filled to the recommended level, then be sure to check every month. Next, get a new air filter. Plenty of air is critical to maximize mileage. Consider changing the spark plugs and getting a tune up. Finally remove any unnecessary items from your car, and your trunk. Every extra pound you haul around is costing you money. Regards, Joe

The tire has it printed right on the side of the tire. You have a maximum pressure and the lowest presure in PSI If it is a steel belted radial they recommend 28 PSI I however like better fuel milage and longer life so I apply 32 PSI to most my tires. If you have a large load you may want put 35 PSI in the tires. The more air the better the gas mileage but there is a point you will reach that will cause the center of the tire to wear out in the middle and to low it will wear the tires out as well, in cold weather I suggest you run 32 PSI for good handleing and good gas mileage and the longest tire wear. Hope this helps.

You cannot rotate front to rear because you have 17in 225 50's on the front and 235's on the rear. The rear tires (and wheels) are slightly wider than those on the front. You can get all the same size...225's if you replace the rear wheels. When you see the price of those wheels, you'll probably continue to purchase tires. You could get a tire with better treadwear..(harder compound), however you will sacrifice ride and handling and probably noise. I would not recommend side to side rotation because unless the tires are remounted and rebalanced, you will change direction..not recommended on radials.

Discount tire has a website for different tire sizes and how the sizes affect the speedometer reading. I changed my tires from a 60 to a 65 series and gained about 5% better mileage. Basically my speedo shows 70 and I am doing 74. So I get 4 free miles every 70 miles on the odometer. Too much change will rob you of power.

i have a 2005 and went to a higher profile tire. nothing but good things have come from it. better ride, better gas mileage, and an all around nicer look. do not go to drastic but the next size up as far as sidewall goes...i am happy with my choice.