My crv 1999 used gasoline 10L/40 mile drive in city I think It eat a lot of gasoline, how to fix this.

The float is sinking. This could be from alcohol used in gasoline.

For a 1995 Toyota Camry 4 cyl, 2.2 L, Automatic 4-spd, that runs on regular gasoline, the miles per gallon in the city is 19 MPG. On the highway, it's 26 MPG, and combined 21 MPG for both city and highway driving. The average cost of gasoline per year for this vehicle would be $2700.00.---------------------------------------------------------------------------------------
VAS 5054A

One tank of gas is not enough to compare mileage. Or are you saying the computer's readout of mpg estimate is showing less? Try a tank or two of premium and see if that helps. Keep track of gas mileage. Driving techniques have a lot to do with gas mileage, as does long trips vs. short trips, highway cruising vs. city driving. For best mileage, do regular maintenance and keep the car in top running condition-good spark plugs and clean filters and clean oil ! Attend to minor problems before they escalate.
If you want to check actual miles per gallon, start with a full tank. Write the odometer reading down, and go. Everytime you put gas in, write down the amount. When you are close to 1,000 miles from the time you started, go fill the tank and include that amount of gas to your previous list. Now add up all the gas used and divide it into the miles to get miles per gallon. (976 miles/31.8 gallons = 30.69 mpg ) . Only one tank will skew your numbers, might be off cause the tank was filled more to the top than the previous fill-up. About a thousand miles of driving will give you a very accurate figure of miles per gallon for your car.

about 7.6. Im in the usa. We use gallons and mph. The conversion is 1mile=1.609 km. 1 liter= .26 gallons. The 4wd crv is rated 19city/23hiway. The conversion i gave u is for the city, youll do a little better on the highway

My Accord V6 '99 has over 215,000. You can use synthetic transmission oil if its zr1 compatible. I change mine every 60,000 or so. Its 3 qts for the v6. The nissan maximas are the ones that have transmissions that generally dont last past 120,000 miles. Why do you still see many 98 and 99 accords still on the road Carlos?
If yours went at 70,000 than you need to buy a haynes manual and keep up with the maintenance on your car. By the way. Honda Accords are notorious for running fine after 200,000 miles. The parts are easy access and if you use a cheap obd2 scanner you can zero in on any problem with the car.

5w20

First, high mileage, older car - loss of mpg.
Second, have you heard of keeping your car in good running shape - meaning doing the maintenance an a regular basis?
Change the oil on time, change the air filter, make sure every thing is working right, make sure the tires are wearing right.
All this contributes to good mpg - but older high milage - loss of mpg.
Can't fix that!

Oil and filter every 7500 miles unless you do heavy work or towing,then its at 5000 miles.usually 10w-30w Or 5w- if extremely cold.Try a test light in the horn wiring.Pull the wire off,earth it using the test light and push the horn to see if you have power there.Work from the horn back to the steering wheel.Hope this helps

Your fuel mileage is about 24.8 MPG.
Your 1997 Neon is reported as getting between 25-34 miles to the gallon (depending on driving conditions)
Do you do a lot of city driving, or highway?
Do you jet around everywhere (like me) or drive like someone's great grandmother?
If you do a lot of the former, you're actually getting good gas mileage.. a lot of the latter and .. well.. check your fuel tank for leaks.