Check engine light is on engine is missing and fuel mileage has droped 4 mpg where is connector for 95 ply grand vog

Bad sending unit in fuel tank

Cadillac DeVille Mileage ' Fuelly

www.fuelly.com > Cars > Cadillac

There are 53 Cadillac DeVilles with reported gas mileage parked at Fuelly. ... Any Submodel, d'Elegance (1), DTS (1), Concours (2), DHS (4), Base (13), Other (32) ... 4 Vehicles; 27 Fuel-ups; 5,215 Miles Tracked; View All 1995 Cadillac DeVilles ... 2 Vehicles; 9 Fuel-ups; 1,664 Miles Tracked; View All 1991 Cadillac DeVilles.

Used 1995 Cadillac DeVille Features & Specs - Edmunds.com

www.edmunds.com > ... > DeVille > 1995 DeVille

Edmunds.comFeatures and specs for the 1995 Cadillac DeVille including fuel economy, transmission, warranty, engine type, cylinders, drive train and more.Missing: 100km

Cadillac history 1997 - Motorera

www.motorera.com/cadillac/cad1990/1997/cad97d.htm

History of Cadillac automobiles for 1997. ... 1997 CADILLAC DEVILLE ... Fuel Economy City/Hwy, 13.8 l/100 km - 9 l/100 km (20.4/31.2 mpg-imp) (17/26 mpg US).

what type of car is it...?does help....

Fuel Info Fuel Tank Capacity: 23 Gallons. EPA Mileage Estimates: (City/Highway/Combined) Automatic: 13 mpg / 19 mpg / 15 mpg Range in Miles: Automatic: 299 mi. / 437 mi. / 345 mi.

hello Fuel Type Regular MPG (city) 25 MPG (highway) 34 MPG (combined) 28

most likely not, but you can improve it by keeping your foot off the gas and brake , so to speak 

you should maybe check all your fuses.

Winter time driving does reduce the MPG due to temp not allowing the fluids to warm to thinner viscosity allowing parts to operate with less friction. Hope this eases you a bit. Have a good day.

to much fuel pressure or bad vacume line

Crummy mileage = normal; our '97 which hardly ever is used for trips gets 11-12 MPG around town - don't whine. The best we ever achieved was ~ 18 on the only long trip it ever made. But then we drive stupid too, and are long-time radar detector users.

You didn't mention how many miles you have on yours but one thing might be; you may be due for a timing chain which can cause that surging effect.