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Re: Can wheels and tires affect gas mileage?
Well braking will drastically reduce your fuel economy, as of course this is taking the inertia energy of the vehicle which you built burning fuel in the engine and then reducing that and changing that inertia into heat.Your tyres do pretty much the same thing as they are a trade off between low rolling resistance and grip which helps you turn and brake. The reason trains have steel wheels is because they turn on tracks, although their braking distance is severely affected. You need to stop quickly in a car and corner safely enough to not end up in a ditch each time you take a corner, and this is why you have high grip rubber tyres on your vehicle.Typically the best way to reduce rolling resistance with your present set of tyres, is to keep them inflated up to pressure, or even slightly over pressure, which most vehicles can afford to do. (arround 5 P.S.I. will do)Other fuel saving techniques which can drastically improve performance are: 1) Remove excess weight such as the spare wheel, jack, wrench etc. Carry a can of tyre sealant instead for minor emergencies. 2) Remove any excess baggage which doesn't need to make permanent home in your car. 3) Remove any unused bike racks, roof racks and spoilers from the car. 4) When driving keep plenty of room between yourself and the car in front. This allows you to use lighter braking force when cruising at speed and also allows you to get off the gas earlier when stopping.The same goes for looking well ahead in the road for red traffic lights or stop signs. Get off the gas early if you are going to be stopping up ahead anyway! 5) Best fuel saving tip overall; plan your route ahead of time. If it's a route you are unfamiliar with then driving around in circles trying to find it is not going to save any fuel at all. Planning ahead and travelling during low traffic volume periods can save a huge quantity of fuel.
6) Share your supermarket/shopping mall trip with a neighbor or friend. You can share the cost of fuel and reduce the number of vehicles on the road at the same time.
7) Manage several errands in one long trip. Cars by far use the most fuel on cold start and during cold running, as well as suffer around 80% of engine wear during cold start only. By keeping your car up to temperature on a longer journey, you can improve your average fuel economy and reduce wear and tear to the engine internals.
8) When accelerating up to cruising speed, use around 75% of the available engine power. Only reserve this method for times when there is little traffic ahead and you can maintain safe braking distances ahead. Getting up to speed more quickly actually saves fuel in the long run. I really don't mean burn the rubber off the wheels and burn your clutch out kind of acceleration though, so take it easy!
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Okay- thanks for the public announcement;...just kidding!
Mike it sounds like you have a heavy foot on the gas pedal- speeding around town- Ohhh, I gotcha' again! Or someone is pilfering your gas by siphoning it out; LOL
Okay, all kidding aside, the following issues can cause poor fuel economy:
Incorrect tire pressure
a bad or malfunctioning oxygen sensor
dirty or plugged air filter
dirty or malfunctioning fuel injectors
improperly working spark plug(s) e,g. misfires or improper gap
poor driving habits, like sudden accelerations
engine idling for inordinate or extensive amounts of time
and as silly or unbelievable as it might sound, the type of motor oil...the viscosity that is used can affect gas mileage by up to 10-12%; regular oil changes using synthetic or manufacturer recommended oil that reduces friction should be employed.
Defective coolant sensor
a leak in the intake manifold or EGR
Poor compression- If you are driving a car that has high mileage, over 100,000 miles, affects fuel economy
clogged catalytic converter or some other restriction in the exhaust system
slipping clutch or transmission
Lugging around excess weight in the car
Any single one of...or combination of the above, could greatly reduce engine performance and affect gas mileage.
Driving habits are the main reason for bad mileage including: excessive idling, fast starts and stops, fast driving in general...best speeds are 50 to 60 MPH for economy, city driving uses most gas, Mechanical problems include underinflated tires, leaving windows open at highway speeds, not keeping engine tuned up, not changing lubricants at proper intervals, not greasing wheel bearings, not aligning and balancing tires..etc
Well first, is the overdrive on or are you in the overdrive gear, also sorry to tell you but these v-8 jeeps get real bad gas mileage, i think highway mileage is 18 and city 14,if you were getting better mileage and the trany is actting up then that will cause the lower mileage, good day.
i don`t quit remember if this year it had fuel injection or not but if it is change the thermostat,as it does affect fuel mileage as it shows the computer that it is running colder than it really is.thus increasing injector on time.i`m presuming this is fuel injected and a bad throttle position sensor(tps) could be causing a problem if it has a maf sensor there could be dirt on the sensor wire that just needs to be cleaned.if its carbureted then the carburetor may need to be rebuilt.
Well gas mileage depends on alot of things first do you have the very common 350 cid small block or the 454 cid big block,2nd Do you drive like around the speed limit or do you go way faster?3rd Do you do mostly highway or in town driving?4th Is it 2wheel drive or 4 wheel drive?Well your average around town for the 350cid motor around town would be about 15 and on the highway 18. If you have the 454cid you would get about 11 around town and about 15 on the highway these figures are also figuring in that the vehicle is tuned up properly.
First, high mileage, older car - loss of mpg.
Second, have you heard of keeping your car in good running shape - meaning doing the maintenance an a regular basis?
Change the oil on time, change the air filter, make sure every thing is working right, make sure the tires are wearing right.
All this contributes to good mpg - but older high milage - loss of mpg.
Can't fix that!
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.
Yes...That's probably a 50 or 55 series tire which by the nature of it's short sidewall will give you a "stiff" ride as compared to a more typical 70 series. Verify that the vibration does not come only when you are braking or accelerating. If you vibrate only when cruising then 95%(unofficial stat) of the time it comes from the tire/wheel/balance assembly.
Is this a new problem? If so, I'd check/replace the catalytic converter. They clog if bad gas gets into them. Performance is usually affected. If the car has alot of mileage, replace all the oxygen sensors...they affect fuel mix. Change your oil to a 5-20 oil. Change your air filter. Change your plugs if more than 70K miles. Check tire pressure (Mr. Obama is right!) Check wheel alignment by looking at tire wear. Repair any loose front end parts. Check brakes for excessive drag...does the vehicle stop straight???? Use Techron additive to clean fuel injectors following instructions. Finally, do you use your brakes alot? Fast starts? On/off the gas alot? Drive smoothly!