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RX-7 2nd Gen Specific (1986-92) RX-7 1986-92 Discussion including performance modifications and technical support sections. |
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#1 |
Mazda Lover
Join Date: Aug 2010
Location: Akron, Ohio
Posts: 319
Rep Power: 15 ![]() |
I always start my car, let it run for 15 minutes till its warm before beginning my trip. Also, its always about a 30 minute drive, close to 25 miles each way. If that helps determine my driving habit.
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![]() 2004 Mazda6 V6 5-spd - still waiting on money for a motor 1991 Mazda RX7 NA 5-spd - my new DD with 145,000 miles |
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#2 |
RCC Addict
Join Date: Mar 2008
Location: Honolulu, Hawaii USA
Posts: 1,813
Rep Power: 19 ![]() |
I assume you're talking about your location "Akron, Ohio"?
I assume that you're running that OXYGENATED gas crap? If so, that explains it. Oxygenated gas will kill, on average, 5% - 10% of your mileage. The oxygenated additive displaces gasoline, so it takes more of this crap to power the engine. Oxygenated gas is a @#%*(_%_ conspiracy. Non-turbo FC's should easily do 15mpg. Mix in some highway / freeway driving, and it should start to head towards 20mpg. Start doing some serious freeway driving, and you can easily break 20mpg and start heading towards 25mpg. At best mileage driving conditions, it'll get close to 30mpg... To do this, do all your driving in top gear and at 3,500RPM - the key is the RPM's, cause you want to keep it right under the secondary fuel injector crossover point. -Ted |
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#3 | |
Mazda Lover
Join Date: Aug 2010
Location: Akron, Ohio
Posts: 319
Rep Power: 15 ![]() |
Quote:
Also this makes complete sense. 3500rpms in 5th gear is quite quick, too quick for being legal around here (fucking 65 max state limit). I may end up trying to see if I can break 20 this summer. Before the cold set in, I was getting 16 pretty easily, and defiantly not taking it easy. So, my car "should" be in good operating order based on fuel usage. I just need to: 1) stay out of the city all together 2) run real gasoline (fuck this shitty winter mix) 3) stay in a warm area 4) drive faster, but stay in the primary injector range.
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![]() 2004 Mazda6 V6 5-spd - still waiting on money for a motor 1991 Mazda RX7 NA 5-spd - my new DD with 145,000 miles |
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#4 | |
rotaryevolution.net
Join Date: Feb 2011
Location: Las Vegas, NV
Posts: 248
Rep Power: 15 ![]() |
Quote:
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#5 |
Lifetime Rotorhead
Join Date: Apr 2010
Location: Elkton, MD
Posts: 874
Rep Power: 16 ![]() |
That would explain the lower than average MPGs. In terms of your run time, for each of your average trips, your car is running for a total of 45 minutes or so, with 15 minutes or so spent idling. Idle = 0 MPG, and if ~33% of your run time is spent at idle, it's easy to see how this would effect your average MPG. Skip the warm up time idling - just drive off but don't beat on it until it's up to operating temp.
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