How many mpg will my 305tbi get with a 700R4?
09-20-2012, 06:42 PM
#53
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Car: 86 camaro coupe
Engine: 305
Transmission: 700r4
Re: How many mpg will my 305tbi get with a 700R4?
ok im not much of a mechanic so bear with me..lol i have an 86 305, i havent had it long and i bought it with "50,000" miles (im sure its more) but anyways im only getting about 14 mpg, it needs some work done but will a good tune up get more mpg and power?
09-24-2012, 06:16 PM
#54
Senior Member
Re: How many mpg will my 305tbi get with a 700R4?
Well tuned with clean air filter, synthetic oil, transmission fluid & differential oil, properly inflated tires, SLP Dual/Dual cat-back etc my 305 TBI/700R4 RS normally gets 28-32 mpg on interstate highway trips. Best ever is 33.5 mpg.
How one drives also effects MPG.
How one drives also effects MPG.
09-29-2012, 05:14 AM
#55
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Car: 1991 Pontiac Firebird
Engine: 5.0 TBI V8
Transmission: A4 :/
Re: How many mpg will my 305tbi get with a 700R4?
I have a 305 TBI that has the 700R4 tranny, but I have an exhaust with the muffler cut off, and the stock air intake with the cover flipped over. I have Bosch Platinum 4+ plugs and Bosch Premium O2 sensor. Replaced the spark plug wires and cap/rotor, running premium fuel, I have gotten up to 31 MPG on the freeway. Going 70 MPH the whole way.
11-07-2012, 12:01 AM
#56
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Car: 1991 RS
Engine: The 305
Transmission: Upgraded 700r4
Axle/Gears: 3.42 Limited Slip
Re: How many mpg will my 305tbi get with a 700R4?
http://imgur.com/llKAp
Now this is not as awesome as the before mentioned 30+ mpg. I was running 059 vortec heads, gmpp intake, ebl system w/tune, newer plugs, old plug wires (with later known busted ignition coil wire), 2.73 open dif. I would like to add this was a roughly 100 mile sample heading hwy 29 south from omaha to kansas city. It's a pretty flat stretch of land and I was averaging 70-75 mph light foot on the pedal. Overall, I averaged 22 mpg on 1.7k mile trip to Richmond Ky from Omaha,ne. First tank of gas was 89 octane (cheaper in NE) then ran on reg 87 octane.
Now this is not as awesome as the before mentioned 30+ mpg. I was running 059 vortec heads, gmpp intake, ebl system w/tune, newer plugs, old plug wires (with later known busted ignition coil wire), 2.73 open dif. I would like to add this was a roughly 100 mile sample heading hwy 29 south from omaha to kansas city. It's a pretty flat stretch of land and I was averaging 70-75 mph light foot on the pedal. Overall, I averaged 22 mpg on 1.7k mile trip to Richmond Ky from Omaha,ne. First tank of gas was 89 octane (cheaper in NE) then ran on reg 87 octane.
Last edited by Teal88; 11-07-2012 at 12:04 AM. Reason: I don't know how to upload thumbnails.
11-16-2012, 07:14 PM
#57
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Car: 1989 camaro rs convertable
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 7.5"3.42 gears forth gen 2000 camar
Re: How many mpg will my 305tbi get with a 700R4?
it seems to me what you need for the best gas mileage is a t56.i realize it will take a while to break even.
11-16-2012, 07:20 PM
#58
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Car: 1984 T/A
Engine: LQ4
Transmission: T56
Axle/Gears: Ford 8.8 4.10 gears
Re: How many mpg will my 305tbi get with a 700R4?
i do all highway driving and im getting spring/summer i get 23/25 highway. When the temp get into the 30/40s it drops to about 15/18
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