Getting ready to drive a 98 hx from LA to Kansas, I am willing to try some experimentation if anyone has any ideas. tried to pick a time when I could bag using a/c. Want to try and get upper 40's mpg, would appreciate any ideas over highly inflating tires and leaving windows up. Thanks, Frank
My wife has a '98 HX and regularly gets 46 - 49 mpg during the summer on mostly highway, 65-75 mph driving and a bit of stop and go rush hour traffic. The only things I've done are
1) overinflate 35 max psi tires to about 38 - 40 psi, and they weren't LRR tires anyway. I just bought 4 new Nokian i3 tires to replace them. Haven;t had a full tank yet to calcualte the MPG.
2) formed a small piece of coroplast behind the driver's rear tire and attached it to the underside to direct the air under the car out underneath the bumper rather than directly into the inside part of the bumper to prevent the parachute effect. the same could be done on the passenger side, but I haven't gotten around to it
3) lower grille block
From my highway driving experience with my VX civic, I've found that if I can avoid going too much over the speed limit my MPG will go up dramatically.
Most used cars I've bought have always needed a tune-up, so I wouldn't get too disappointed if you don't reach your 50 MPG goal quite yet. I'm sure it'll be possible in the future once you get used to driving the car more.
On the never-ending quest for better gas mileage...
Do you have a good synthetic transmission fluid in the car?
Also rip out any extra weight you may be hauling around with you.
Make sure you have a new air filter in the car when you leave on your trip.
Also run a good fuel system cleaner through the fuel system. Redline S1 and Techron are two very good over the counter products.
Also if your capable of doing it leave at 8 pm on your trip. That way you will not be driving in the hot sun. The first 10 hours would be under nightfall and cooler temperatures. There would be less need for the AC to running during the night hours.
I would caution you if your not a "night" person driving all night can be dangerous.
At least 3 to 4 mornings each week a trucker falls a sleep on the Pennsylvania Turnpike causing one side or the other to close for a few hours for clean up.