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" Q: I was reading about the SmartCar. Why is the British version is rated at 46 mpg city and 70 mpg hwy? The U.S. version is listed at 33 mpg city and 41 mpg hwy. I thought the British rating may be based on kilometers, but it specifies mpg. Is their rating system different?  A: Imperial Gallons are bigger than US (avoirdupois) gallons.  Q: I have about thirty quarts of 10w-30 SF SE oil, thirty-plus years old in metal and paper cans. It&amp;#039;s been stored at a temperature between 65 and 85 degrees. Is it all right to use in a 2001 vehicle? A: No. The SF specification is out of date, and the additive package is almost certainly stale. Save this oil for greasing the garage door or the bar on the chainsaw.  Q: Which saves more fuel: Driving at a higher rpm/lower gear with less throttle or a lower rpm/higher gear with more throttle?  A: Lower rpm/higher gear will save more fuel.  Q: I have a 1993 Plymouth Voyager, 3.3, two-wheel drive, all power. The issue I have is with the A/C. I had to put in an on-off switch for the engine fan. The solenoid stopped working and that was the only fix. There were no issues with that fix until last year. The A/C blower motor is now the issue. While driving with the blower on at any speed with the air direction set straight on, a portion of the air is directed to the floor vents. If the engine requires more power like driving uphill, the vent door opens and all the air is redirected to the floor vent. If the blower is on full and the car is started, the complete airflow is directed to the floor vents. In either case, when the blower motor is shut off and on, the vent door closes and the air redirects to the selected vents. However, if starting the vehicle and the blower is on any other speed this does not occur. Suggestions? A: This is a vacuum issue, not a blower issue. Leaky hose, bad check valve, split vacuum fitting, or something else is not keeping an air blend door in the right position.   Q: I have a 2000 Jeep Grand Cherokee. The automatic lock mechanism on the driver&amp;#039;s side door squeaks when I unlock it. Can I fix this myself? I hate to pay $300 to the dealer. A: Remove the inner door panel and squirt some spray white lithium grease on the squeak.  "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/cars/how-to/a2839/4270753/>