32 front 32 back you can up the pressure for better mileage & handling
You'll want to look for a performance air filter. Basically these increase gas mileage by increasing air supply. The more air which is available and circulating, the better the overall gas mileage.
There is no magic to increasing the mileage. Make sure the engine is running the best it can. New plugs, wires, vacuum hoses, air filter. Correct air pressure in all tires. Drive for mileage, as in, take off slow, drive the speed limit. Other than that, there is not much you can do. Don't waste your money on so called, mileage enhancer devices. They do not work, and will only lighten your billfold.
The recommended mileage for a tune-up is between 3,000 and 5,000 miles. This ensures that the vehicle is operating at maximum efficiency.
Yes to a degree. As the pressure is increased, there is less tire contact with the road surface (grip is reduced accordingly) and gas milaege improves slightly.
No. A car will get better mileage with the correct tire pressure.
Your vehicle will not run if you bypass the computer. Nothing you can do to the computer will increase fuel mileage. Assuming the engine in your vehicle is running properly, keep your tire pressure as outlined in your owners manual, carry as little weight in the vehicle as possible, take off slowly and drive the speed limit. Other than doing this there's nothing you can do to increase fuel mileage.
Tripometer is a great app for tracking your mileage. Milebug is another that is recommended.
50.5 cents is the government recommended mileage reimbursement for North Carolina.
BMW does not have a recommended millage for a transmission service on a 1997 540-I.