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tjhunter Champion Author Colorado Springs Posts:1,965 Points:760,045 Joined:Sep 2006	Message Posted: Jan 11, 2011 7:11:37 PM Ignore tjhunter Report Abuse I have a 2002 Avalanche 1500 with a 31 gallon tank and have size 305-50-20 tires. I currently hold PSI @ 35lbs. I average 13mpg on a tank. If I use 50lbs will it increase or decrease my mpg? Rating on the tires is 50. I regularly rotate & align & check air (2-3x a mo on air pressure)

tjhunter

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Colorado Springs

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Points:760,045
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Message Posted: Jan 11, 2011 7:11:37 PM

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I have a 2002 Avalanche 1500 with a 31 gallon tank and have size 305-50-20 tires. I currently hold PSI @ 35lbs. I average 13mpg on a tank. If I use 50lbs will it increase or decrease my mpg? Rating on the tires is 50. I regularly rotate & align & check air (2-3x a mo on air pressure)

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killadi Rookie Author Toronto Posts:62 Points:13,410 Joined:Feb 2007	Message Posted: Feb 11, 2011 1:33:25 PM Ignore killadi Report Abuse Don't go by the PSI on the tire, that is the maximum pressure that the tire can withstand without bursting. Instead, go by the PSI listed on the owner's manual of the car or dashboard placard.
GManCo Champion Author Colorado Springs Posts:4,981 Points:947,815 Joined:Sep 2010	Message Posted: Feb 10, 2011 11:11:53 PM Ignore GManCo Report Abuse 35 psi
MIT05 Champion Author Massachusetts Posts:4,147 Points:1,387,325 Joined:Aug 2008	Message Posted: Feb 9, 2011 11:10:50 AM Ignore MIT05 Report Abuse 350/35 psi 14 inch tires
Boyrr Champion Author Allentown Posts:15,160 Points:3,159,880 Joined:May 2004	Message Posted: Feb 9, 2011 5:07:19 AM Ignore Boyrr Report Abuse 35 psi sounds low for that machine
MrNemo Sophomore Author Miami Posts:247 Points:220,945 Joined:Aug 2009	Message Posted: Feb 8, 2011 7:17:46 PM Ignore MrNemo Report Abuse So you think you should use the door jam pressure? Quote "Regardless of what vehicle you have, use the maximum pressure listed on the sidewall. Higher pressure results in better performance, decreased tire wear, and it lessens your chance of hydroplaning at a given speed." Driving Under Pressure Proper Tire Pressure Could Save Your Life [Edited by: MrNemo at 2/8/2011 8:19:10 PM EST]
rick_evans Champion Author Boston Posts:3,704 Points:1,029,730 Joined:Aug 2005	Message Posted: Jan 31, 2011 6:16:05 AM Ignore rick_evans Report Abuse What's the recommended tire pressure on car door? I would use that and consider adjusting driving style.
OilerFan Champion Author Tulsa Posts:14,032 Points:2,445,440 Joined:Aug 2005	Message Posted: Jan 31, 2011 3:29:09 AM Ignore OilerFan Report Abuse I agree with Saferoads. Easy on the pedal means noticeable gas saving and better mileage.
Saferroads Rookie Author Twin Cities Posts:1 Points:120 Joined:Jan 2011	Message Posted: Jan 30, 2011 11:36:56 PM Ignore Saferroads Report Abuse As a driving instructor and businessman, I see many drivers that are inefficient behind the wheel. When you are more gentle on the pedals, it is amazing how much gas you can save.
amize15 Rookie Author Salem Posts:48 Points:35,065 Joined:Jan 2011	Message Posted: Jan 30, 2011 10:13:04 PM Ignore amize15 Report Abuse I get around 320 on a tank.
binkhouse Veteran Author Tucson Posts:468 Points:46,045 Joined:Dec 2010	Message Posted: Jan 30, 2011 9:03:32 PM Ignore binkhouse Report Abuse Bigger tires also mean your speedometer and odometer are probably not reading correctly. Double-check with GPS or other method. Figure the percent of difference and apply that same percentage to any change in MPG you are experiencing. GManCo is right about center-wear from overinflating. Tire pressure recommendation on door of car factors in specific weight, handling, braking characteristics of your vehicle. Number on tire for maximum pressure does not factor in what your vehicle weighs. Just a "blow up the balloon" number. [Edited by: binkhouse at 1/30/2011 10:06:26 PM EST]
Duke_26 Champion Author Vermont Posts:4,059 Points:809,235 Joined:Jan 2011	Message Posted: Jan 18, 2011 5:02:40 AM Ignore Duke_26 Report Abuse about 240 miles a tank on average.
GManCo Champion Author Colorado Springs Posts:4,981 Points:947,815 Joined:Sep 2010	Message Posted: Jan 17, 2011 8:40:00 PM Ignore GManCo Report Abuse Depends on the load. If a light load and high tire pressure, you will wear the center of the tire. If a heavy load and light tire pressure, you will wear the outside tread.
Mizzer1 Champion Author Worcester Posts:4,250 Points:838,175 Joined:Dec 2010	Message Posted: Jan 16, 2011 11:26:51 PM Ignore Mizzer1 Report Abuse About 400 miles a tank.
WEPSMAN Champion Author South Dakota Posts:10,508 Points:2,021,975 Joined:Mar 2005	Message Posted: Jan 13, 2011 3:32:10 PM Ignore WEPSMAN Report Abuse I would inflate them to recommended pressure. I would also consider going back to the original tire size. Bigger tires will affect your mileage. I had a 2002 Avalanche and averaged 17mpg stock.
Let2011 Sophomore Author Vancouver Posts:172 Points:28,170 Joined:Jan 2011	Message Posted: Jan 12, 2011 11:55:21 PM Ignore Let2011 Report Abuse I'll try to follow the recommended psi, see if it will increase my mpg.
ekelly7 Champion Author Twin Cities Posts:18,291 Points:3,528,700 Joined:Oct 2001	Message Posted: Jan 12, 2011 10:11:47 AM Ignore ekelly7 Report Abuse about 425
gvan Champion Author Chicago Posts:21,502 Points:2,832,290 Joined:Dec 2004	Message Posted: Jan 12, 2011 9:56:30 AM Ignore gvan Report Abuse DO NOT inflate your tires to what is indicated on the tire sidewall. Use the PSI number that is located on the door jamb or on the door. That is the correct tire pressure for that vehicle. The owners manual will explain correct tire pressure also. The tires may be inflated a few pounds over that figure but no more than a few pounds for safety reasons.
PhilT08 Champion Author Buffalo Posts:2,105 Points:120,575 Joined:Oct 2008	Message Posted: Jan 11, 2011 11:01:39 PM Ignore PhilT08 Report Abuse you will get minimal improvement in fuel economy and wear the tires in the center costing a lot more money in the end to replace prematurely worn tires and also run a very HIGH risk of a blowout which could result in a serious accident. for the best over all performance inflate your tires to the PSI (do not exceed) stated on the tire sidewall.