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If they just installed it, have them reinstall. Shouldn't be a charge to you. They forgot to hook something up or blew the fuse.
Take to a shop and have them check exhaust flow. Could be a fouled and failing cat. converter.
With the vehicle turned off, Touch the voltmeter to black on battery and the red to the connection at the alternator. If the read is 0 then you have a break between the alternator and battery. Follow the red wire from alternator to the fuse box. Is it possible the fusible link has burnt out at the fuse box.
Need to have scanned for codes. Can get a free read at autozone then post result. Probably a misfire condition or exhaust flow issue.
Plugged up cat. converter. Needs replaced.
Betting on the master cylinder has failed. Check to see if the rear seal is leaking.
You put a UV oil leak dye in the crankcase and use a blacklight to try to find the location. Possible head gasket, valve gasket and seals or upper pan gasket leak. Or take to shop to find leak.
Need to get the codes read and post results to further assist you. Autozone will read the check engine codes for free. It is possible a caliper has frozen up and is dragging on the rotor. This will make it harder to accelerate and will burn up gas more quickly.
Do you have a check engine light on? If so, get code read at an autozone for free and post results. Otherwise, change spark plugs and air filter and see if the MPG inproves. May just need a tune-up. Also, saw your other post which may be the answer to your problem.
It could just be sme build-up of carbon in the block. Try a good oil detergent to clean the lifters at next oil change and see if that helps.