Manowarr

I have a 1992 Lumina with 3.1L V6 engine and 4 speed auto trans. It is the 4 door sedan. When I drive on the interstate going 70 mph I get 32-35 mpg. What is weird though is if I drive 55 mph on state highways I only get about 28 mpg.

I keep my car tuned up, maintaned, and keep the tire pressure up, and here is what else I have done:

K&N filter
Slick 50 oil treatment
Tornado gas saver

I don't know how much the Tornado contributes to the good mileage. Maybe it only works good at the higher speeds.
Anyone else use one of those with success?

Bearwulf

I use Castrol Syntec Blend w/NAPA filters. Not unusual mileage for these autos if running good oil and tune-up, proper tire inflation, clean filters,etc.
The reason for the drop @lower speed is the gear ratio in that OD. trans with factory tire size. If most of driving is on 55 or less roads, drop 1 profile size (70 to 65)but keep same width (205, 195...) for handling. These will do better in lower speed situations as the engine will not have to work as hard.

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Bearwulf, the "howling Grizzly" of the north.
90-Eurosport
91-2 dr. euro body-220k got t-boned
91-4 dr. " "
93Eurosport
GRANDPARENTS RULE!!!!!!!!!

dwalmop

I tend not to waste my time/money on anything that's "too good to be true"...because it IS. However, I've haven't heard anything neither good nor bad about the tornado.

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Great quote: "I am noticing a loud fuel odor"

gixxeracer87

Take off the Tornado and see what your gas mileage is then.