I'm getting 27-28 and I drive mostly HWY doing 75-80. How fast do you drive and are you maintaining constant speed on the HWY? Are you just going by your mpg read out?

 

Install a 'K&N' Air Filter Kit. (You can do it yourself). That will up your fuel mileage considerably!! Also keep your spark plugs fresh; change every 20,000mi. and use the new Iridium plugs. Check fuel filter every 20,000mi.

 

You may want to read the results of oil analysis after using K&N air filters.

https://www.chevyhhr.net/forums/general-hhr-4/oil-analysis-k-n-filter-23002/

 

Dam, while it is possible to maintain over 31mpg, all it takes is one weekend of being in a hurry, on several short trips, to wreak the whole thing!!

 

Where's the fuel filter?

 

K&N will not increase you mileage. If you see a change, probably just "looking" for it. I use K&N and back them fully, great filters IMO. But for mileage. Don't count on it.

Why would anyone change out plugs, especially iridium, every 20K miles? They won't need it, and with the cost of iriduim plugs, you won't save any money.....

Fuel filter, that can vary greatly with the fuel you get.

 

I'm going to be a "little" pessimistic here, BUT.....


If someone provides information/data as you have, I would seriously consider challenging your expertise/wisdom....

CONSIDERABLY is a relative term. But I would suggest, maybe 1 mpg, is not considerable UNLESS a driver is a very heavy use person.....maybe 200-300 miles a day.

As mentioned, why replace Iridium plugs with Iridium plugs every 20,000 miles. The saving in fuel mileage is balanced out with the considerable cost of the new Iridium plugs.

If someone wishes to "....check the fuel filter....." the fuel tank would need to be emptied, the tank and attaching fuel inlet/outlet disconnected and the tank dropped from the vehicle, the fuel pump and resulting apparatus removed and the filtering screen inspected. Then ALL reinstalled in the reverse order. The FUEL FILTER IS ATTACHED TO THE INTERNAL TANK FUEL PUMP.

I doubt if YOU perform ANY of YOUR suggested maintenance.

 

YEAH Snoopy!!

 

psst.... The fuel filter is right over the rear beam. If you look under the car. look right over to the right of the beam and over by the gas tank you will see a little silver tube. Thats the fuel filter. Its not in the tank.

Or at least that what I was told....

 

I wouldn't think the fuel filter would be in the tank...you're supposed to change those as routine maintenance on cars... I would think it would be accessible. Then again, I never would have guessed the battery would be in the trunk either, or that they'd have a hatch on the steering column in case your key gets stuck...