Can cb7s get 40ish mpg?

[ca93accord]

I currently get 33 MPG w my stock engine. Had my timing belt and all other required time change items recently done.

If high 30 or low to high 40 MPG is possible, how does one do it, specifically for a stock engine? I understand the basic mx practice like changing or adjust at the appropriate time intervals to get good MPG
Spark plugs and wires
Air filter...i dont worry abt that bc i have a KN filter
Tire pressure
Coasting to a stop
Etc

If there are SECRET SQUIRREL tricks from the experienced cb7 veterans, i would like to know. I love me some MPG.

[deevergote]

Tire pressure and compound will play a role for sure. Harder tire compounds provide less rolling resistance. Tire width also plays a part. The skinnier the tire, the less resistance it will provide (just don't go nuts... stay within safe limits! Less tire also means less control.)
Wheel/tire weight can also have an impact. The lighter the better. You'd also do best to have a wheel that is closed, rather than something with open spokes. A wheel with a broad face is more aerodynamic. Take a look at the wheels on the original Insight, or the early Civic Hybrid. Closed wheels. Small wheels. INSANELY lightweight wheels. Unfortunately, those wheels are not an option on CBs.

Make sure your brake components, front and rear, are in perfect working order. A dragging caliper will cost mpg.

I've read that extended side skirts will improve aerodynamics more than anything else. I haven't tested this, or seen it tested on a CB7, however. Trucks do it, though. I'm sure you've noticed modern trailers with panels under the trailer itself, between the rear wheels of the trailer and the rear wheels of the truck. That's for improved fuel economy.

Weight reduction helps. Eliminate anything you don't need. If you're really serious, yank your passenger seat, as that's pretty heavy. The less your car weighs, the less effort it takes to move it. Don't forget about the driver! If you're chunky... go on a diet.

Obviously a good tune up is absolutely necessary.

An ECU tune to trim the fuel mixture a bit (within safe limits) can also gain a few MPG (though the PT3 and PT6 ECUs are pretty good from the factory.)


40 might be pushing it, aside from pure highway mileage... but I'm sure it's possible with enough care. Driving habits, weather, and terrain also play a role. A light foot on a cool, dry day, on perfectly flat roads will yield the best mpg. Hills, hot or wet weather, and aggressive driving will cause it to go down.

[ca93accord]

Thanks for the quick reply deevergote but now u got me thinking about my brake caliper. When i changed my brake pads, i didnt really adjust anything. Was i suppose to? I will researching about that this afternoon. All in all thanks deevergote

[SEgirl]

I used to get around 400 miles per tank with mine back in the day (93 SE sedan all stock) However, the majority of that was interstate driving about 100 miles a day. Speed limit was lower then so I wasn't driving as fast, and I was using premium gas since it was cheap.

I drive '91 SE stock sedan daily now, and the most I've gotten so far is about 390 before the light comes on. That's just going back and forth to work which is about 75% interstate and driving between 65-75mph. If I do more in town driving, then I get between 350-375 miles per tank.

[ca93accord]

I used to get around 400mg with mine back in the day (SE sedan all stock) However, the majority of that was interstate driving about 100 miles a day. Speed limit was lower then so I wasn't driving as fast, and I was using premium gas since it was cheap.

I drive '91 SE stock sedan daily now, and the most I've gotten so far is about 390 before the light comes on. That's just going back and forth to work which is about 75% interstate and driving between 65-75mph. If I do more in town driving, then I get between 350-375mpg.

SEgirl
Thanks. From what you said and deevergote said, i believe i am doing good

[deevergote]

Driven fairly conservatively, I got 30mpg with my lightly modified H22A.

[xtotek]

SEgirl
Thanks. From what you said and deevergote said, i believe i am doing good

I think the most I ever got was around 36mpg. I'd say you're not too bad.

[masospaghetti]

My family had a 93 Accord DX bought new. It would easily get 35 mpg at 70 MPH with the automatic transmission.

The 92 EX and 93 EX I've owned recently wouldn't go above the low 30's, higher mileage and more aggressively geared manual transmission are the likely culprits. With the H23A1 and short ratio M2S4 transmission I'm averaging around 25 mpg city/highway mix.

40 mpg is probably not realistic at safe driving speeds.

[Bolex]

My coupe f20z1 22mpg or 11 liters per 100km.I don't know how but it's too high fuel consuption.Maybe o2 sensor?

[Raf99]

Most i ever got was 32MPG with a coupe i had. These cars are so old now that you'll never get 40MPG due to the friction of all the *old* moving parts.

Between aero dynamics (shape of the car, rubber seals for doors/windows, front end efficiency, wheels, etc.), the friction of moving parts (axles, engine parts, etc.), and the technology used in the engine (port flow, injector locations, other fuel saving technology), and the weight of the car, I just can't see you reaching 40MPG.

It would be interesting to have someone tape up the car, use skinny tires, new axles and fresh oil change, etc to see how many MPG they can get.

[Bolex]

How much cost 1 gallon?here in croatia (europe) 1 liter of eurosuper 95 cost 1.3USD.

[thumping_accord]

Depending on if you want to spend money on tuning an ECU you could get better mpg from that. I currently get right around 30mpg with my H22A and that's with some spirited driving mixed in every now and then.... I'm sure if I grannied it I would get 30+ mpg. but I give all the credit to my tuner, since he tuned my car for the best economy by speed not rpm.... aka 75mph I get the best possible fuel economy.

[deevergote]

How much cost 1 gallon?here in croatia (europe) 1 liter of eurosuper 95 cost 1.3USD.

Wow. That's expensive!

I live in New Jersey, which has some of the lowest prices (though we just got a $0.23/gallon tax increase last week... we're not happy about it.) I just paid $2.65/gallon for 92 octane (your eurosuper 95 is equivalent to 91 octane in the US.) I just filled my car with 17 gallons (my 2006 Cadillac CTS-V), which cost me about $45. At your prices, that would have cost me about $175!
I would never be able to drive my 15mpg Cadillac at those prices!

[Bolex]

It's very expensive,yes!lot's of people installing gas in cars because the price of one liter is 0.50$.
First to do is to clean injectors and check o2 sensor and eventually replace with new one,timing and fuel pressure

[xtotek]

Most i ever got was 32MPG with a coupe i had. These cars are so old now that you'll never get 40MPG due to the friction of all the *old* moving parts.

Between aero dynamics (shape of the car, rubber seals for doors/windows, front end efficiency, wheels, etc.), the friction of moving parts (axles, engine parts, etc.), and the technology used in the engine (port flow, injector locations, other fuel saving technology), and the weight of the car, I just can't see you reaching 40MPG.

It would be interesting to have someone tape up the car, use skinny tires, new axles and fresh oil change, etc to see how many MPG they can get.

I've owned several CB7s and never once got close to 40mpg no matter what I tried. 35mpg was about the best.